[docs] [issue23499] Minor grammar issue in mimetypes.rst

[Ned Deily]

Ned Deily added the comment:

Thanks!

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nosy: +ned.deily
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions: +Python 2.7, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23499>
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