[docs] [issue13801] The Python 3 Docs doesn't highlight nonlocal

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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nosy: +ezio.melotti, georg.brandl
versions:  -Python 3.1

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13801>
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