Run rustfmt on nightly to clean up erroneous comments (#5106)

## Summary

This PR runs `rustfmt` with a few nightly options as a one-time fix to
catch some malformatted comments. I ended up just running with:

```toml
condense_wildcard_suffixes = true
edition = "2021"
max_width = 100
normalize_comments = true
normalize_doc_attributes = true
reorder_impl_items = true
unstable_features = true
use_field_init_shorthand = true
```

Since these all seem like reasonable things to fix, so may as well while
I'm here.

crates/ruff_formatter/src/format_extensions.rs

@@ -57,7 +57,6 @@ pub trait MemoizeFormat<Context> {
     /// # Ok(())
     /// # }
     /// ```
-    ///
     fn memoized(self) -> Memoized<Self, Context>
     where
         Self: Sized + Format<Context>,
@@ -142,7 +141,6 @@ where
     /// assert_eq!("Counter:\n\tCount: 0\nCount: 0\n", formatted.print()?.as_code());
     /// # Ok(())
     /// # }
-    ///
     /// ```
     pub fn inspect(&mut self, f: &mut Formatter<Context>) -> FormatResult<&[FormatElement]> {
         let result = self