[issue45680] Documentation on `GenericAlias` objects and `__class_getitem__` could be improved

[Alex Waygood]

Alex Waygood <Alex.Waygood at Gmail.com> added the comment:

Thanks so much to Ken, Łukasz, Jelle, Guido, and everybody else who helped review these PRs!

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45680>
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