[docs] [issue15629] Add to regrtest the ability to run Lib and Doc doctests

[Brett Cannon]

Brett Cannon added the comment:

I should mention that http://bugs.python.org/issue10967 exists as a meta issue about trying to gut regrtest in favour of using other things in unittest (and doctest in this case) when possible.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15629>
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