mypy

gh-151914: Copyedit "What's new in Python 3.16" (#151915) #22009

Job	Run time
Run mypy on Tools/check-c-api-docs	20s
Run mypy on Tools/peg_generator	17s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/clinic	18s
Run mypy on Tools/jit	19s
Run mypy on Lib/_pyrepl	21s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/build	17s
Run mypy on Tools/cases_generator	19s
	2m 48s

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