[docs] [issue15580] fix True/False/None reST markup

[Chris Jerdonek]

Changes by Chris Jerdonek <chris.jerdonek at gmail.com>:


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stage:  -> patch review
versions: +Python 2.7, Python 3.2, Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15580>
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