[docs] [issue42194] Docs for argparse.BooleanOptionalAction missing "New in version 3.9"

Oct. 29, 2020


      Change by Roundup Robot <devnull@psf.upfronthosting.co.za>:


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keywords: +patch
nosy: +python-dev
nosy_count: 2.0 -> 3.0
pull_requests: +21944
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/23026

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<https://bugs.python.org/issue42194>
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