[docs] [issue15629] Run doctests in Doc/*.rst as part of regrtest

Richard Oudkerk added the comment:

the occasional typos can be found by simply run `make doctest` every once in a while).

But doesn't "make doctest" attempt to run the doctests using Python 2.x (because Sphinx does not support Python 3.x). ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue15629> _______________________________________