Merge 3.4 (asyncio doc)

diff --cc Doc/library/subprocess.rst
index 6e495b343044cb4f18bb12ab2b0713a2ce17d15f,36cbf3c5f364a42d6a3c8979d57e67203f0a7364..49a82bd92a62e6b9c3474b97f9e1c0f676f6dfe4
--- 1/Doc/library/subprocess.rst
--- 2/Doc/library/subprocess.rst
+++ b/Doc/library/subprocess.rst
@@@ -634,8 -634,7 +634,8 @@@ Instances of the :class:`Popen` class h
     ``None``, if no data should be sent to the child.  The type of *input*
     must be bytes or, if *universal_newlines* was ``True``, a string.
  
-    :meth:`communicate` returns a tuple ``(stdoutdata, stderrdata)``.
+    :meth:`communicate` returns a tuple ``(stdout_data, stderr_data)``.
 +   The data will be bytes or, if *universal_newlines* was ``True``, strings.
  
     Note that if you want to send data to the process's stdin, you need to create
     the Popen object with ``stdin=PIPE``.  Similarly, to get anything other than