Reveal.add/remveEventListener -> Reveal.on/off

demo.html

@@ -374,7 +374,7 @@
 						Additionally custom events can be triggered on a per slide basis by binding to the <code>data-state</code> name.
 					</p>
 					<pre><code class="javascript" data-trim contenteditable style="font-size: 18px;">
-Reveal.addEventListener( 'customevent', function() {
+Reveal.on( 'customevent', function() {
 	console.log( '"customevent" has fired' );
 } );
 					</code></pre>