mypy

Doc: fix incorrect reference in `isasyncgenfunction` docs (GH-144099) #1

Job	Run time
Run mypy on Tools/jit	23s
Run mypy on Tools/build	16s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/peg_generator	23s
Run mypy on Tools/cases_generator	17s
Run mypy on Tools/check-c-api-docs	17s
Run mypy on Tools/clinic	20s
Run mypy on Lib/tomllib	21s
Run mypy on Lib/_pyrepl	27s
	3m 3s

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