[docs] [issue18707] the readme should also talk about how to build doc.

Madison May added the comment: Good point, Éric. It refers readers to the bug tracker, the Sphinx bug tracker, and docs@python.org in the `Contributing` section, but a link to the devguide would probably be more useful. I've tweaked the patch a bit to reflect this. ---------- Added file: http://bugs.python.org/file31268/README_v3.diff _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue18707> _______________________________________