[docs] [issue13522] Document error return values for PyFloat_* and PyComplex_*

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset edc981ce8748 by Victor Stinner in branch '3.2':
Issue #13522: Fix _Py_co_pow() documentation
http://hg.python.org/cpython/rev/edc981ce8748

New changeset 2863470caebb by Victor Stinner in branch '2.7':
Issue #13522: Fix _Py_co_pow() documentation
http://hg.python.org/cpython/rev/2863470caebb

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