[issue12029] [doc] clarify that except does not match virtual subclasses of the specified exception type

[Irit Katriel]

Change by Irit Katriel <iritkatriel at gmail.com>:


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue12029>
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