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

[R. David Murray]

R. David Murray added the comment:

I prefer to have some of them be links and some of them be code markup.  That is, I think there is value in having some of them be links.  As Georg said, the devguide rule is more about it not being *necessary* to waste time marking them *all* up as constants.  Having some of them marked up as constants will be enough to lead a newbie to the documentation for them.

When writing new docs, I will typically mark them up as constants once or twice in the new docs, and make the remainder code markup.

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<http://bugs.python.org/issue15580>
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