[docs] [issue20882] Link to OpenHatch “getting started” page from devguide

[Éric Araujo]

Éric Araujo added the comment:

I think it would make sense to have the link at the top of the setup.rst file instead, so that people being directly linked to that page would see the link too.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20882>
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