Fix typos found by codespell (#9346)

## Summary

Fix typos found by
[codespell](https://github.com/codespell-project/codespell).

## Test Plan

CI tests.

crates/ruff_python_formatter/src/string/mod.rs

@@ -941,7 +941,7 @@ impl UnicodeEscape {
                             }
                         }
                     } else {
-                        // Unterminated escape sequence, dont' normalise it.
+                        // Unterminated escape sequence, don't normalise it.
                         return None;
                     }
                 }