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

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Well, it's sort of documented implicitly:  from

http://docs.python.org/c-api/intro.html#exceptions

"In general, when a function encounters an error, it sets an exception, discards any object references that it owns, and returns an error indicator.  If not documented otherwise, this indicator is either NULL or -1, depending on the function’s return type."

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versions:  -Python 3.1

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