[docs] [issue25909] Incorrect documentation for PyMapping_Items and like

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> This is equivalent to the Python expression ``list(o.keys())``.

This sentence is not correct.

And comments in Include/abstract.h are not absolutely correct too.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25909>
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