[docs] [issue17285] subprocess.check_output incorrectly state that output is always bytes

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


----------
nosy: +terry.reedy
versions: +Python 3.4 -Python 3.1

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17285>
_______________________________________