mypy

gh-132898: Add a note in `multiprocessing.Process` docs about creatin… #9422

Job	Run time
Run mypy on Lib/tomllib	19s
Run mypy on Tools/build	22s
Run mypy on Lib/_pyrepl	18s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/clinic	17s
Run mypy on Tools/peg_generator	19s
Run mypy on Tools/jit	17s
	2m 28s

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