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

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

_Py_c_pow() doc is wrong:

+   If :attr:`exp.imag` is not null, or :attr:`exp.real` is negative,
+   this method returns zero and sets :c:data:`errno` to :c:data:`EDOM`.

The function only fails if num=0 and exp.real < 0 or if num=0 and exp.imag != 0.

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nosy: +haypo
resolution: fixed -> 
status: closed -> open

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13522>
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