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_python_semantic/src/definition.rs

@@ -202,8 +202,8 @@ impl<'a> Deref for Definitions<'a> {
 }
 
 impl<'a> IntoIterator for Definitions<'a> {
-    type Item = Definition<'a>;
     type IntoIter = std::vec::IntoIter<Self::Item>;
+    type Item = Definition<'a>;
 
     fn into_iter(self) -> Self::IntoIter {
         self.0.into_iter()

crates/ruff_python_semantic/src/scope.rs

@@ -250,6 +250,7 @@ impl Default for Scopes<'_> {
 
 impl<'a> Deref for Scopes<'a> {
     type Target = IndexSlice<ScopeId, Scope<'a>>;
+
     fn deref(&self) -> &Self::Target {
         &self.0
     }