Reduce potential confusion in priority explanation

I always get tripped up by event priority. In my mind, I think priority 1 executes before priority 2. I'm backwards, I know...

This PR should help remove any confusion for myself and others by explicitly stating "priority 3 executes before priority 2" and so on.

Author: simshaun

components/event_dispatcher.rst

@@ -147,11 +147,12 @@ The ``addListener()`` method takes up to three arguments:
 
 #. The event name (string) that this listener wants to listen to;
 #. A PHP callable that will be executed when the specified event is dispatched;
-#. An optional priority integer (higher equals more important and therefore
-   that the listener will be triggered earlier) that determines when a listener
-   is triggered versus other listeners (defaults to ``0``). If two listeners
-   have the same priority, they are executed in the order that they were
-   added to the dispatcher.
+#. An optional priority integer that determines when a listener is triggered
+   versus other listeners (defaults to ``0``). A higher priority integer means
+   the listener will be triggered earlier. So, priority 3 executes before
+   priority 2. Priority 2 executes before priority 1. Priority 1 executes before
+   priority 0, and so on. If two listeners have the same priority, they are
+   executed in the order that they were added to the dispatcher.
 
 .. note::