[docs] [issue13997] Clearly explain the bare minimum Python 3 users should know about Unicode

[Chris Rebert]

Chris Rebert <pybugs at rebertia.com> added the comment:

Links to the "rambling Unicode thread"s for posterity and convenience:

Gets into several issues, among them, Unicode:
http://mail.python.org/pipermail/python-ideas/2012-February/013665.html

Unicode-specific offshoot of the above:
http://mail.python.org/pipermail/python-ideas/2012-February/013825.html

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<http://bugs.python.org/issue13997>
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