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

[Robert Collins]

Robert Collins added the comment:

Thanks for the patch. I've committed the current status as an unambiguous improvement; we can add tempdir as deprecated later if there is consensus on that, the current patch did improve its docs per R. David Murray's request anyhow.

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resolution:  -> fixed
stage: commit review -> resolved
status: open -> closed

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<http://bugs.python.org/issue23725>
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