[docs] [issue21198] Minor tarfile documentation bug

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


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type: enhancement -> 
versions:  -Python 3.1, Python 3.2, Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21198>
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