mypy

decimal docs: specification link and examples (#128698) #18560

Job	Run time
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/jit	17s
Run mypy on Tools/clinic	21s
Run mypy on Lib/tomllib	17s
Run mypy on Lib/_pyrepl	21s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Tools/peg_generator	19s
Run mypy on Tools/build	17s
	2m 30s

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