mypy

gh-151819: Clarify the conditional-pattern email example in re docs (… #22317

Job	Run time
Run mypy on Tools/build	31s
Run mypy on Tools/clinic	30s
Run mypy on Lib/_pyrepl	31s
Run mypy on Tools/jit	32s
Run mypy on Tools/cases_generator	28s
Run mypy on Tools/check-c-api-docs	24s
Run mypy on Lib/tomllib	31s
Run mypy on Lib/test/libregrtest	32s
Run mypy on Tools/peg_generator	31s
	4m 30s

Provide feedback