[issue42258] argparse: show choices once per argument

[Roundup Robot]

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


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keywords: +patch
nosy: +python-dev
nosy_count: 1.0 -> 2.0
pull_requests: +22056
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/23143

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42258>
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