[docs] [issue17860] subprocess docs lack info how to use output result

[anatoly techtonik]

anatoly techtonik added the comment:

The only thing that can save the docs is pictures. Or tables.

          +---------+---------------------------+
          |         | universal_newlines = True |
   +------+---------+---------------------------+
   |Py.2  |   str   |         str               |
   +------+         |                           |
   |Py.3  |  bytes  |         str               |
   +------+---------+---------------------------+

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17860>
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