docs: change "shell script" codeblock to "shell"

```shell script
    ```

breaks mkdocs rendering

docs/github.md

@@ -14,7 +14,7 @@ authenticated http.
 The simplest way to start with Jujutsu, is creating a stack of commits, before
 creating any branch.
 
-```shell script
+```shell
 # Start a new commit off of `main`
 $ jj new main
 # Refactor some files, then add a description and start a new commit
@@ -45,7 +45,7 @@ branches. In a co-located repository, `jj` isn't the source of truth. But
 Jujutsu allows an incremental migration, as `jj commit` updates the HEAD of the
 git repository.
 
-```shell script
+```shell
 $ nvim docs/tutorial.md
 $ # Do some more work.
 $ jj commit -m "Update tutorial"
@@ -61,7 +61,7 @@ In a Jujutsu repository, the workflow is simplified. If there's no need for
 explicitly named branches, you just can generate one for a change. As Jujutsu is
 able to create a branch for a revision.
 
-```shell script
+```shell
 $ # Do your work
 $ jj commit
 $ # Jujutsu automatically creates a branch
@@ -81,7 +81,7 @@ force-pushing[^2].
 If your project prefers that you address review comments by adding commits on
 top, you can do that by doing something like this:
 
-```shell script
+```shell
 $ # Create a new commit on top of the `your-feature` branch from above.
 $ jj new your-feature
 $ # Address the comments, by updating the code
@@ -99,7 +99,7 @@ $ jj git push.
 If your project prefers that you keep commits clean, you can do that by doing
 something like this:
 
-```shell script
+```shell
 $ # Create a new commit on top of the second-to-last commit in `your-feature`,
 $ # as reviews requested a fix there.
 $ jj new your-feature-

docs/install-and-setup.md

@@ -16,13 +16,13 @@ On most distributions, you'll need to build from source using `cargo` directly.
 First make sure that you have the `libssl-dev`, `openssl`, and `pkg-config`
 packages installed by running something like this:
 
-```shell script
+```shell
 sudo apt-get install libssl-dev openssl pkg-config
 ```
 
 Now run:
 
-```shell script
+```shell
 cargo install --git https://github.com/martinvonz/jj.git --locked --bin jj jj-cli
 ```
 
@@ -31,14 +31,14 @@ cargo install --git https://github.com/martinvonz/jj.git --locked --bin jj jj-cl
 If you're on Nix OS you can use the flake for this repository.
 For example, if you want to run `jj` loaded from the flake, use:
 
-```shell script
+```shell
 nix run 'github:martinvonz/jj'
 ```
 
 You can also add this flake url to your system input flakes. Or you can
 install the flake to your user profile:
 
-```shell script
+```shell
 nix profile install 'github:martinvonz/jj'
 ```
 
@@ -46,7 +46,7 @@ nix profile install 'github:martinvonz/jj'
 
 If you use linuxbrew, you can run:
 
-```shell script
+```shell
 brew install jj
 ```
 
@@ -56,7 +56,7 @@ brew install jj
 
 If you use Homebrew, you can run:
 
-```shell script
+```shell
 brew install jj
 ```
 
@@ -65,7 +65,7 @@ brew install jj
 You can also install `jj` via [MacPorts](https://www.macports.org) (as
 the `jujutsu` port):
 
-```shell script
+```shell
 sudo port install jujutsu
 ```
 
@@ -75,7 +75,7 @@ sudo port install jujutsu
 
 You may need to run some or all of these:
 
-```shell script
+```shell
 xcode-select --install
 brew install openssl
 brew install pkg-config
@@ -84,7 +84,7 @@ export PKG_CONFIG_PATH="$(brew --prefix)/opt/openssl@3/lib/pkgconfig"
 
 Now run:
 
-```shell script
+```shell
 cargo install --git https://github.com/martinvonz/jj.git --locked --bin jj jj-cli
 ```
 
@@ -92,7 +92,7 @@ cargo install --git https://github.com/martinvonz/jj.git --locked --bin jj jj-cl
 
 Run:
 
-```shell script
+```shell
 cargo install --git https://github.com/martinvonz/jj.git --locked --bin jj jj-cli --features vendored-openssl
 ```
 
@@ -100,7 +100,7 @@ cargo install --git https://github.com/martinvonz/jj.git --locked --bin jj jj-cl
 
 You may want to configure your name and email so commits are made in your name.
 
-```shell script
+```shell
 $ jj config set --user user.name "Martin von Zweigbergk"
 $ jj config set --user user.email "martinvonz@google.com"
 ```
@@ -113,19 +113,19 @@ jj <= 0.7.0). Exactly how to source it depends on your shell.
 
 ### Bash
 
-```shell script
+```shell
 source <(jj util completion)  # --bash is the default
 ```
 
 Or, with jj <= 0.7.0:
 
-```shell script
+```shell
 source <(jj debug completion)  # --bash is the default
 ```
 
 ### Zsh
 
-```shell script
+```shell
 autoload -U compinit
 compinit
 source <(jj util completion --zsh)
@@ -133,7 +133,7 @@ source <(jj util completion --zsh)
 
 Or, with jj <= 0.7.0:
 
-```shell script
+```shell
 autoload -U compinit
 compinit
 source <(jj debug completion --zsh)
@@ -141,25 +141,25 @@ source <(jj debug completion --zsh)
 
 ### Fish
 
-```shell script
+```shell
 jj util completion --fish | source
 ```
 
 Or, with jj <= 0.7.0:
 
-```shell script
+```shell
 jj debug completion --fish | source
 ```
 
 ### Xonsh
 
-```shell script
+```shell
 source-bash $(jj util completion)
 ```
 
 Or, with jj <= 0.7.0:
 
-```shell script
+```shell
 source-bash $(jj debug completion)
 ```
 

docs/tutorial.md

@@ -10,7 +10,7 @@ If you haven't already, make sure you
 ## Cloning a Git repo
 
 Let's start by cloning GitHub's Hello-World repo using `jj`:
-```shell script
+```shell
 # Note the "git" before "clone" (there is no support for cloning native jj
 # repos yet)
 $ jj git clone https://github.com/octocat/Hello-World
@@ -21,7 +21,7 @@ $ cd Hello-World
 ```
 
 Running `jj st` (short for`jj status`) now yields something like this:
-```shell script
+```shell
 $ jj st
 Parent commit: 7fd1a60b01f9 Merge pull request #6 from Spaceghost/patch-1
 Working copy : d7439b06fbef (no description set)
@@ -38,7 +38,7 @@ command.
 Now let's say we want to edit the `README` file in the repo to say "Goodbye"
 instead of "Hello". Let's start by describing the change (adding a
 commit message) so we don't forget what we're working on:
-```shell script
+```shell
 # This will bring up $EDITOR (or `pico` or `Notepad` by default). Enter
 # something like "Say goodbye" in the editor and then save the file and close
 # the editor.
@@ -47,7 +47,7 @@ Working copy now at: e427edcfd0ba Say goodbye
 ```
 
 Now make the change in the README:
-```shell script
+```shell
 # Adjust as necessary for compatibility with your flavor of `sed`
 $ sed -i 's/Hello/Goodbye/' README
 $ jj st
@@ -62,7 +62,7 @@ remove existing files. To untrack a path, add it to your `.gitignore` and run
 `jj untrack <path>`.
 
 To see the diff, run `jj diff`:
-```shell script
+```shell
 $ jj diff --git  # Feel free to skip the `--git` flag
 diff --git a/README b/README
 index 980a0d5f19...1ce3f81130 100644
@@ -87,7 +87,7 @@ VCSs, there is also a `jj checkout/co` command, which is practically a synonym
 for `jj new` (you can specify a destination for `jj new` as well).
 
 So, let's say we're now done with this change, so we create a new change:
-```shell script
+```shell
 $ jj new
 Working copy now at: aef4df99ea11 (no description set)
 $ jj st
@@ -114,7 +114,7 @@ sense to use `jj checkout` so you can easily review your adjustments with
 
 You're probably familiar with `git log`. Jujutsu has very similar functionality
 in its `jj log` command:
-```shell script
+```shell
 $ jj log
 @  mpqrykypylvy martinvonz@google.com 2023-02-12 15:00:22.000 -08:00 aef4df99ea11
 │  (empty) (no description set)
@@ -141,7 +141,7 @@ refers to the working-copy commit, `root` refers to the root commit,
 `branches()` refers to all commits pointed to by branches. We can combine
 expressions with `|` for union, `&` for intersection and `~` for difference. For
 example:
-```shell script
+```shell
 $ jj log -r '@ | root | branches()'
 @  mpqrykypylvy martinvonz@google.com 2023-02-12 15:00:22.000 -08:00 aef4df99ea11
 ╷  (empty) (no description set)
@@ -169,7 +169,7 @@ input set if they're ancestors of other revisions in the set.
 
 Now let's see how Jujutsu deals with merge conflicts. We'll start by making some
 commits:
-```shell script
+```shell
 # Start creating a chain of commits off of the `master` branch
 $ jj new master -m A; echo a > file1
 Working copy now at: 00a2aeed556a A
@@ -198,7 +198,7 @@ $ jj log
 
 We now have a few commits, where A, B1, and B2 modify the same file, while C
 modifies a different file. Let's now rebase B2 directly onto A:
-```shell script
+```shell
 $ jj rebase -s puqltuttrvzp -d nuvyytnqlquo
 Rebased 2 commits
 Working copy now at: 1978b53430cd C
@@ -230,7 +230,7 @@ from getting rebased on top.
 Now let's resolve the conflict in B2. We'll do that by creating a new commit on
 top of B2. Once we've resolved the conflict, we'll squash the conflict
 resolution into the conflicted B2. That might look like this:
-```shell script
+```shell
 $ jj new puqltuttrvzp  # Replace the ID by what you have for B2
 Working copy now at: c7068d1c23fd (no description set)
 Added 0 files, modified 0 files, removed 1 files
@@ -282,7 +282,7 @@ descendants to its parent.
 Jujutsu keeps a record of all changes you've made to the repo in what's called
 the "operation log". Use the `jj op` (short for `jj operation`) family of
 commands to interact with it. To list the operations, use `jj op log`:
-```shell script
+```shell
 $ jj op log
 @  d3b77addea49 martinvonz@vonz.svl.corp.google.com 2023-02-12 19:34:09.549 -08:00 - 2023-02-12 19:34:09.552 -08:00
 │  squash commit 63874fe6c4fba405ffc38b0dd926f03b715cf7ef
@@ -300,7 +300,7 @@ $ jj op log
 
 The most useful command is `jj undo` (alias for `jj op undo`), which will undo
 an operation. By default, it will undo the most recent operation. Let's try it:
-```shell script
+```shell
 $ jj undo
 Working copy now at: 63874fe6c4fb (no description set)
 $ jj log
@@ -338,7 +338,7 @@ can [configure `scm-diff-editor`](config.md#setting-up-scm-diff-editor) instead.
 
 We'll need some more complex content to test these commands, so let's create a
 few more commits:
-```shell script
+```shell
 $ jj new master -m abc; printf 'a\nb\nc\n' > file
 Working copy now at: f94e49cf2547 abc
 Added 0 files, modified 0 files, removed 1 files
@@ -365,7 +365,7 @@ that by running `jj squash -i` (short for `jj squash --interactive`) on the
 third commit. Remember that `jj squash` moves all the changes from one commit
 into its parent. `jj squash -i` moves only part of the changes into its parent.
 Now try that:
-```shell script
+```shell
 $ jj squash -i
 Using default editor 'meld'; you can change this by setting ui.diff-editor
 Working copy now at: 52a6c7fda1e3 ABCD
@@ -374,7 +374,7 @@ That will bring up Meld with a diff of the changes in the "ABCD" commit. Modify
 the right side of the diff to have the desired end state in "ABC" by removing
 the "D" line. Then save the changes and close Meld. If we look at the diff of
 the second commit, we now see that all three lines got capitalized:
-```shell script
+```shell
 $ jj diff -r @-
 Modified regular file file:
    1    1: aA
@@ -390,7 +390,7 @@ conflicts.
 Let's try one final command for changing the contents of an exiting commit. That
 command is `jj diffedit`, which lets you edit the contents of a commit without
 checking it out.
-```shell script
+```shell
 $ jj diffedit -r @-
 Using default editor 'meld'; you can change this by setting ui.diff-editor
 Created 70985eaa924f ABC