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

Richard Oudkerk added the comment: An example from the output of "make doctest" which fails because Python 2.x is being used: ********************************************************************** File "library/multiprocessing.rst", line 453, in default Failed example: print(p, p.is_alive()) Expected: <Process(Process-1, initial)> False Got: (<Process(Process-1, initial)>, False) ********************************************************************** ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue15629> _______________________________________