mypy

gh-143674: Document F/D complex format characters in struct module (#… #10074

Job	Run time
Run mypy on Tools/cases_generator	19s
Run mypy on Lib/_pyrepl	17s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/check-c-api-docs	16s
Run mypy on Tools/build	12s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/clinic	17s
Run mypy on Tools/peg_generator	18s
Run mypy on Tools/jit	20s
	2m 34s

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