[issue23864] doc: issubclass without registration only works for "one-trick pony" collections ABCs.

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


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nosy: +miss-islington
nosy_count: 12.0 -> 13.0
pull_requests: +26687
pull_request: https://github.com/python/cpython/pull/28266

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue23864>
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