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

[Roundup Robot]

Roundup Robot added the comment:

New changeset de6976fe19aa by Ezio Melotti in branch '2.7':
#11643: fix rst markup error in site.rst.
http://hg.python.org/cpython/rev/de6976fe19aa

New changeset 7aca2781c381 by Ezio Melotti in branch '3.2':
#11643: fix rst markup error in site.rst.
http://hg.python.org/cpython/rev/7aca2781c381

New changeset c6892ce7e56f by Ezio Melotti in branch 'default':
#11643: merge with 3.2.
http://hg.python.org/cpython/rev/c6892ce7e56f

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nosy: +python-dev

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<http://bugs.python.org/issue11643>
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