[docs] [issue29563] Update Devguide about building documentation.

[Brett Cannon]

Brett Cannon added the comment:

Would you mind moving this issue over to https://github.com/python/devguide/issues where we track devguide issues, Jim?

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nosy: +brett.cannon

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