correct out of date comments and typos

src/derived/slot.rs

@@ -72,8 +72,7 @@ where
     /// Last revision when the memoized value was observed to change.
     changed_at: Revision,
 
-    /// If true, then this value was considered a constant when last
-    /// verified.
+    /// Minimum durability of the inputs to this query.
     durability: Durability,
 
     /// The inputs that went into our query, if we are tracking them.

src/revision.rs

@@ -1,14 +1,14 @@
 use std::num::NonZeroU64;
 use std::sync::atomic::{AtomicU64, Ordering};
 
-/// Value if the initial revision, as a u64. We don't use 0
+/// Value of the initial revision, as a u64. We don't use 0
 /// because we want to use a `NonZeroU64`.
 const START_U64: u64 = 1;
 
 /// A unique identifier for the current version of the database; each
 /// time an input is changed, the revision number is incremented.
 /// `Revision` is used internally to track which values may need to be
-/// recomputed, but not something you should have to interact with
+/// recomputed, but is not something you should have to interact with
 /// directly as a user of salsa.
 #[derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
 pub struct Revision {

src/runtime.rs

@@ -571,7 +571,7 @@ struct ActiveQuery<DB: Database> {
     /// What query is executing
     database_key: DB::DatabaseKey,
 
-    /// True if all inputs were constant (and no untracked inputs).
+    /// Minimum durability of inputs observed so far.
     durability: Durability,
 
     /// Maximum revision of all inputs observed. If we observe an
@@ -587,7 +587,7 @@ pub(crate) struct ComputedQueryResult<DB: Database, V> {
     /// Final value produced
     pub(crate) value: V,
 
-    /// True if all inputs were constant (and no untracked inputs).
+    /// Minimum durability of inputs observed so far.
     pub(crate) durability: Durability,
 
     /// Maximum revision of all inputs observed. If we observe an