[issue12256] Link isinstance/issubclass doc to abc module

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

I committed a modified version of the patch.

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resolution:  -> fixed
stage: commit review -> committed/rejected
status: open -> closed

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