[issue20751] Harmonize descriptor protocol documentation: direct call, super binding with Descriptor Howto docs

[Arthur Milchior]

Change by Arthur Milchior <arthur at milchior.fr>:


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pull_requests: +28486
pull_request: https://github.com/python/cpython/pull/30271

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue20751>
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