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

[Zbyszek Jędrzejewski-Szmek]

Changes by Zbyszek Jędrzejewski-Szmek <zbyszek at in.waw.pl>:


Added file: http://bugs.python.org/file39104/tempfile_docs.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23725>
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