[issue15605] Explain sphinx documentation building in devguide

[Roundup Robot]

Roundup Robot added the comment:

New changeset f32569ddc2db by Georg Brandl in branch 'default':
Closes #15605: update and refurbish doc building section of the devguide.
http://hg.python.org/devguide/rev/f32569ddc2db

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nosy: +python-dev
resolution:  -> fixed
stage:  -> committed/rejected
status: open -> closed

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<http://bugs.python.org/issue15605>
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