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

[Sandro Tosi]

Sandro Tosi <sandro.tosi at gmail.com> added the comment:

The status of the patches is this:

unicode_doc-2.7.patch - to be applied on 2.7
unicode_doc-3.1.patch - to be applied on 3.1
unicode_doc-default.patch - to be applied on 3.2 and then merged on default

I had to prepare multiple patches since the files are very different between supported branches.

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