[docs] [issue27242] Make the docs for NotImplemented & NotImplementedError unambiguous

[Emanuel Barry]

Emanuel Barry added the comment:

Thanks Ethan for the improved patch! Pointed out a typo and some nits, but other than that it's mostly good. I'm not that good at brevity, and I think your patch is much better on that regard :)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27242>
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