Fixed minor issues

cookbook/event_dispatcher/event_listener.rst

@@ -103,11 +103,12 @@ using a special "tag":
     ``on`` + "camel-cased event name". If the event is ``kernel.exception`` the
     method executed by default is ``onKernelException()``.
 
-    The other optional tag attribute is called  ``priority`` which defaults to ``0``.
-    This value ranges from ``-255`` to ``255`` and it controls the order in which
-    listeners are executed (the highest the priority, the earlier a listener is
-    executed). This is useful when you need to guarantee that one listener is
-    executed before another.
+    The other optional tag attribute is called  ``priority``, which defaults to
+    ``0`` and it controls the order in which listeners are executed (the highest
+    the priority, the earlier a listener is executed). This is useful when you
+    need to guarantee that one listener is executed before another. The priorities
+    of the internal Symfony events range from ``-255`` to ``255`` but your own
+    events can use any positive or negative integer.
 
 Creating an Event Subscriber
 ----------------------------
@@ -119,7 +120,7 @@ they are listening to.
 
 In a given subscriber, different methods can listen to the same event. The order
 in which methods are executed is defined by the ``priority`` parameter of each
-method (the higher the priority, the earlier the method is called). To learn more
+method (the higher the priority the earlier the method is called). To learn more
 about event subscribers, read :doc:`/components/event_dispatcher/introduction`.
 
 The following example shows an event subscriber that defines several methods which