[issue23931] Update DevGuide link in Quickstart Step 1

[Roundup Robot]

Roundup Robot added the comment:

New changeset 6b9c91135e1b by Berker Peksag in branch 'default':
Issue #23931: Add a link to the "Version Control Setup" section in index.rst.
https://hg.python.org/devguide/rev/6b9c91135e1b

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nosy: +python-dev

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<http://bugs.python.org/issue23931>
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