[issue12256] Link isinstance/issubclass doc to abc module

[Sandro Tosi]

Sandro Tosi <sandro.tosi at gmail.com> added the comment:

I think the patch is fine to apply.

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nosy: +ezio.melotti, sandro.tosi
stage: patch review -> commit review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12256>
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