mypy

gh-142411: Change documentation to reflect the new docstring adjustme… #18492

Job	Run time
Run mypy on Tools/clinic	20s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/jit	21s
Run mypy on Lib/test/libregrtest	14s
Run mypy on Tools/build	17s
Run mypy on Lib/_pyrepl	18s
Run mypy on Tools/cases_generator	19s
Run mypy on Tools/peg_generator	18s
	2m 25s

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