[issue43024] improve signature (in help, etc) for functions taking sentinel defaults

[Irit Katriel]

Change by Irit Katriel <iritkatriel at yahoo.com>:


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keywords: +patch
pull_requests: +23150
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/24331

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43024>
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