[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 67a4e8fe650e by Victor Stinner in branch 'default':
Issue #13522: Fix _Py_co_pow() documentation
http://hg.python.org/cpython/rev/67a4e8fe650e

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<http://bugs.python.org/issue13522>
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