If a chain ends, we don't count the chain itself when calculating the
padding to use before text. This patch updates a few tests to use
multi-line descriptions so this is seen.
We actually already have a case of this bug `test_operations.rs`. I
noticed that when I added that test, but it didn't bother me enough to
fix it until now.
It's much easier to update the tests with `insta`.
It also presents you with the bad output including real newlines (a
diff, actually), so we can remove the `println!()` calls we had in
order to get readable output without escaped newlines.
