gh-82180: Update math.factorial(float) doc for Python 3.10

[vstinner]

• Issue: No longer use implicit convertion to int with loss #82180

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📚 Documentation preview 📚: https://cpython-previews--105385.org.readthedocs.build/

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Update the doc for a change made in Python 3.10: issue #82180, commit 578c395.

cc @serhiy-storchaka

[serhiy-storchaka]

Not sure whether it should be "value" or "values". Was it error in the current writing?

[vstinner]

I made the phrasing closer to the previous text. Thanks for reviews @serhiy-storchaka.

Not sure whether it should be "value" or "values". Was it error in the current writing?

I suppose that it's "values", so I kept the old text ;-)