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

[R. David Murray]

R. David Murray added the comment:

They aren't equivalent in python2, either.  I think probably the wording should be changed to something like "and the method keys() should return an iterable that provides access to the same data".

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nosy: +r.david.murray

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<http://bugs.python.org/issue22918>
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