[docs] [issue15436] __sizeof__ is not documented

[Martin v. Löwis]

Martin v. Löwis added the comment:

> I think there is one difference between __len__ and __sizeof__. __sizeof__ 
> should be overloaded only for C-implemented classes. IMHO, it is a part of C 
> API.

That is a reasonable point. So documenting it along with the type slots
might be best.

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<http://bugs.python.org/issue15436>
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