[issue25735] math.factorial doc should mention integer return type

[Mark Dickinson]

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

> Should the documentation patch for this be converted to a PR

I think so, yes. How about we open a new issue for the factorial(Decimal(...)) behaviour, and keep this one focused on the original reported issue?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue25735>
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