[docs] [issue22918] Doc for __iter__ makes inexact comment about dict.__iter__

[Raymond Hettinger]

Raymond Hettinger added the comment:

> I think the first half of the sentence is enough: 
> “For mappings, it should iterate over the keys of the container.”

That should do it :-)

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nosy: +rhettinger

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22918>
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