mypy

gh-106318: Improve str.rstrip() method doc (#143893) #19480

Job	Run time
Run mypy on Tools/check-c-api-docs	20s
Run mypy on Tools/clinic	19s
Run mypy on Lib/_pyrepl	25s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/jit	16s
Run mypy on Tools/build	20s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/cases_generator	23s
Run mypy on Tools/peg_generator	19s
	2m 59s

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