mypy

Doc: fix duplicated words (#136086) #15515

Job	Run time
Run mypy on Lib/test/libregrtest	14s
Run mypy on Lib/tomllib	15s
Run mypy on Lib/_pyrepl	15s
Run mypy on Tools/jit	17s
Run mypy on Tools/clinic	15s
Run mypy on Tools/build	15s
Run mypy on Tools/cases_generator	15s
Run mypy on Tools/peg_generator	14s
	2m 0s

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