mypy

gh-140374: Add glossary entries related to multithreading (#140375) #18589

Job	Run time
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/peg_generator	20s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/clinic	19s
Run mypy on Tools/build	17s
Run mypy on Lib/_pyrepl	19s
Run mypy on Tools/jit	18s
Run mypy on Lib/test/libregrtest	19s
	2m 28s

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