bpo-34344 Fix AbstractEventLoopPolicy.get_event_loop docstring (GH-16463)

(cherry picked from commit b23a8423a923077e4f83d3f328bb7542b4c940ed)

Co-authored-by: idomic <michael.ido@gmail.com>
diff --git a/Lib/asyncio/events.py b/Lib/asyncio/events.py
index d381b1c..ca08663 100644
--- a/Lib/asyncio/events.py
+++ b/Lib/asyncio/events.py
@@ -626,9 +626,9 @@
         self._local = self._Local()
 
     def get_event_loop(self):
-        """Get the event loop.
+        """Get the event loop for the current context.
 
-        This may be None or an instance of EventLoop.
+        Returns an instance of EventLoop or raises an exception.
         """
         if (self._local._loop is None and
                 not self._local._set_called and