[docs] [issue11840] Improvements to c-api/unicode documentation

[Sandro Tosi]

Changes by Sandro Tosi <sandro.tosi at gmail.com>:


Added file: http://bugs.python.org/file21658/unicode_doc-3.1.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11840>
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