bpo-30935: update get_event_loop docs (GH-2731)

Doc/library/asyncio-eventloops.rst

@@ -176,12 +176,15 @@ An event loop policy must implement the following interface:
       Get the event loop for the current context.
 
       Returns an event loop object implementing the :class:`AbstractEventLoop`
-      interface.
+      interface. In case called from coroutine, it returns the currently
+      running event loop.
 
       Raises an exception in case no event loop has been set for the current
       context and the current policy does not specify to create one. It must
       never return ``None``.
 
+      .. versionchanged:: 3.6
+
    .. method:: set_event_loop(loop)
 
       Set the event loop for the current context to *loop*.

Doc/whatsnew/3.6.rst

@@ -819,7 +819,7 @@ Notable changes in the :mod:`asyncio` module since Python 3.5.0
 (all backported to 3.5.x due to the provisional status):
 
 * The :func:`~asyncio.get_event_loop` function has been changed to
-  always return the currently running loop when called from couroutines
+  always return the currently running loop when called from coroutines
   and callbacks.
   (Contributed by Yury Selivanov in :issue:`28613`.)