[issue5250] Document __instancecheck__ and __subclasscheck__

[Chris Rebert]

Chris Rebert <pybugs at rebertia.com> added the comment:

This might need to be reopened.

There's a verb missing from he following sentence of the patch:
"This is consistent with the lookup of special methods that called on instances, only that in this case the instance is itself a class."

Secondly, and more importantly, the issubclass() and isinstance() docs don't mention the new special methods in question.

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