[docs] [issue15355] generator docs should mention already-executing exception

[R. David Murray]

R. David Murray added the comment:

Confirmed that 2.7 raises the same errors (as I expected) using your test.

Thanks, Chris.

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

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15355>
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