mypy

Docs: Fix typos and a comment in enum.rst (#148156) #20750

Job	Run time
Run mypy on Tools/cases_generator	16s
Run mypy on Tools/peg_generator	16s
Run mypy on Lib/_pyrepl	19s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/jit	18s
Run mypy on Tools/build	16s
Run mypy on Tools/check-c-api-docs	19s
Run mypy on Tools/clinic	21s
	2m 43s

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