[docs] [issue25064] Adjust tempfile documentation for bytes filename support

[Roundup Robot]

Roundup Robot added the comment:

New changeset de79e483565c by Martin Panter in branch '3.5':
Issue #25064: Adjust documentation according to new mkstemp signature
https://hg.python.org/cpython/rev/de79e483565c

New changeset c495c9dd7726 by Martin Panter in branch 'default':
Issue #25064: Merge tempfile doc from 3.5
https://hg.python.org/cpython/rev/c495c9dd7726

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nosy: +python-dev

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<http://bugs.python.org/issue25064>
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