[docs] [issue15561] update subprocess docs to reference io.TextIOWrapper

Andrew Svetlov added the comment: Hmm. As I can see in subprocess.py TextIOWrapper is applied to stdin also in non-buffered (write_through=True) mode. So input will be converted to use '\n' as well. Can you reflect this fact in your patches? ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue15561> _______________________________________