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

[R. David Murray]

R. David Murray added the comment:

Oh, because of the O_TMPDIR bits, this patch is only applicable to 3.5, so I'm removing 3.4 from versions.  I don't think it is worth it to make a version that would apply to 3.4, since it is not the case that the 3.4 docs are *wrong*.

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versions:  -Python 3.4

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