mypy

gh-69619: Clarify "whitespace" in the `str.{l,r}strip()` documentatio… #21768

Job	Run time
Run mypy on Tools/build	16s
Run mypy on Tools/cases_generator	17s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Lib/tomllib	18s
Run mypy on Lib/_pyrepl	17s
Run mypy on Tools/check-c-api-docs	16s
Run mypy on Tools/peg_generator	18s
Run mypy on Tools/clinic	17s
Run mypy on Tools/jit	18s
	2m 35s

Provide feedback