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_formatter/src/statement/stmt_assign.rs

@@ -7,7 +7,6 @@ use ruff_formatter::{write, Buffer, Format, FormatResult};
 use ruff_python_ast::prelude::Expr;
 use rustpython_parser::ast::StmtAssign;
 
-//
 // Note: This currently does wrap but not the black way so the types below likely need to be
 // replaced entirely
 //