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

[Raymond Hettinger]

Change by Raymond Hettinger <raymond.hettinger at gmail.com>:


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keywords: +patch
nosy: +rhettinger
nosy_count: 11.0 -> 12.0
pull_requests: +26644
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/28218

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