[docs] [issue23725] update tempfile docs to say that TemporaryFile is secure

[Robert Collins]

Robert Collins added the comment:

I'm not 100% sure that tempfile.tempdir should be deprecated. Its much less convenient to control global behaviour with that. I agree that mktemp should be.

I've updated the patch though.

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nosy: +rbcollins
Added file: http://bugs.python.org/file40120/issue-23725.patch

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