[issue29563] Update Devguide about building documentation.

[Zachary Ware]

Zachary Ware added the comment:

I'd suggest replacing as much as possible in the devguide with a link to Doc/README.rst (or Doc/README.txt, if that's what it still is).  Other improvements should be made in the README.

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nosy: +zach.ware

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29563>
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