Add comment indicating default value of `format` parameter in `typing… #4596

Job	Run time
Check scripts and tests with mypy (win32)	17s
Check scripts and tests with pyright (Windows)	19s
Check scripts and tests with pyright (Linux)	17s
Check scripts and tests with mypy (linux)	18s
Stubsabot dry run	30s
	1m 41s

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