[docs] [issue33894] tempfile.tempdir cannot be unset

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

I like philiprowlands' version:

- If tempdir is unset or None at any call to
+ If tempdir is None (the default) at any call to

Care to produce a PR?

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versions: +Python 2.7, Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33894>
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