mypy

Docs: Fix typo in codecs documentation (GH-140883) #17659

Job	Run time
Run mypy on Lib/tomllib	17s
Run mypy on Lib/_pyrepl	20s
Run mypy on Tools/cases_generator	21s
Run mypy on Tools/clinic	19s
Run mypy on Tools/peg_generator	20s
Run mypy on Lib/test/libregrtest	22s
Run mypy on Tools/jit	18s
Run mypy on Tools/build	21s
	2m 38s

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