[docs] [issue11643] Use |version| instead of X.Y in the doc

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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type:  -> enhancement
versions: +Python 3.4 -Python 3.1

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11643>
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