Spellcheck & grammar (#10375)

## Summary

I used `codespell` and `gramma` to identify mispellings and grammar
errors throughout the codebase and fixed them. I tried not to make any
controversial changes, but feel free to revert as you see fit.

crates/ruff_linter/src/rules/pydocstyle/rules/blank_before_after_class.rs

@@ -60,7 +60,7 @@ impl AlwaysFixableViolation for OneBlankLineBeforeClass {
 ///
 /// ## Why is this bad?
 /// [PEP 257] recommends the use of a blank line to separate a class's
-/// docstring its methods.
+/// docstring from its methods.
 ///
 /// This rule may not apply to all projects; its applicability is a matter of
 /// convention. By default, this rule is enabled when using the `google`

crates/ruff_linter/src/rules/pydocstyle/rules/not_missing.rs

@@ -368,7 +368,7 @@ impl Violation for UndocumentedPublicPackage {
 /// ## Why is this bad?
 /// Magic methods (methods with names that start and end with double
 /// underscores) are used to implement operator overloading and other special
-/// behavior. Such methods should should be documented via docstrings to
+/// behavior. Such methods should be documented via docstrings to
 /// outline their behavior.
 ///
 /// Generally, magic method docstrings should describe the method's behavior,