[docs] [issue16227] Add link to 3.3 version in unicode howto

[Roundup Robot]

Roundup Robot added the comment:

New changeset c59884f4bc8d by Chris Jerdonek in branch '2.7':
Issue #16227: Add to 2.x Unicode HOWTO a link to the Python 3 version.
http://hg.python.org/cpython/rev/c59884f4bc8d

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nosy: +python-dev

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<http://bugs.python.org/issue16227>
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