[docs] [issue15521] Dev Guide should say how to run tests in 2.7

[Roundup Robot]

Roundup Robot added the comment:

New changeset 851adff2d434 by Ezio Melotti in branch 'default':
#15521: mention that test.regrtest is necessary to run tests on 2.7.  Patch by Chris Jerdonek.
http://hg.python.org/devguide/rev/851adff2d434

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nosy: +python-dev

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