[docs] [issue10468] Document UnicodeError access functions

[Eli Bendersky]

Eli Bendersky <eliben at gmail.com> added the comment:

Attaching a patch for Doc/c-api/exceptions.rst

Added a new section named "Unicode exceptions", and documented the relevant functions from Include/pyerrors.h

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keywords: +patch
Added file: http://bugs.python.org/file19747/issue10468.1.patch

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