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

[Alex Waygood]

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

Wait... there's still PR 29479 open!

But that can wait a little while -- getting PR 29335 over the line is definitely worth celebrating!!

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