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

[John Belmonte]

Change by John Belmonte <john at neggie.net>:


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nosy: +jbelmonte
nosy_count: 6.0 -> 7.0
pull_requests: +24938
pull_request: https://github.com/python/cpython/pull/26348

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42194>
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