mypy

Doc: Fix missing closing parenthesis in argparse example (#143488) #18909

Job	Run time
Run mypy on Tools/check-c-api-docs	19s
Run mypy on Lib/_pyrepl	21s
Run mypy on Tools/peg_generator	21s
Run mypy on Tools/jit	21s
Run mypy on Tools/clinic	18s
Run mypy on Tools/cases_generator	17s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/build	18s
Run mypy on Lib/test/libregrtest	20s
	2m 52s

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