[issue5250] Document __instancecheck__ and __subclasscheck__

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

Fixed the missing verb in r80084.  I don't think the new special methods need to be mention in isinstance() or issubclass() docs; they are very rarely needed, and other builtins don't mention their special methods either (e.g. abs(), complex(), or getattr().)

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<http://bugs.python.org/issue5250>
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