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

[Chris Jerdonek]

Chris Jerdonek added the comment:

> FWIW this is already mentioned in the quick start [0].

I didn't catch that, thanks.

> Do you want to propose a patch for runtest.rst?

Sure.

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<http://bugs.python.org/issue15521>
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