mypy

gh-136823: Update documentation on excluded headers in Python.h (#136… #9452

Job	Run time
Run mypy on Lib/tomllib	18s
Run mypy on Lib/_pyrepl	16s
Run mypy on Tools/build	14s
Run mypy on Tools/jit	15s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/clinic	14s
Run mypy on Tools/peg_generator	17s
	2m 12s

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