Updates message docs about dismissable message

server/documents/collections/message.html.eco

@@ -75,6 +75,14 @@ type        : 'UI Collection'
       </div>
       <p>This is a special notification which you can dismiss if you're bored with it.</p>
     </div>
+    <div class="warning ui message">
+      <p>Dismissable blocks do not automatically close when using the close icon, this behavior must be defined using javascript, for example:</p>
+      <div class="code">
+      $('.message .close').on('click', function() {
+        $(this).closest('.message').fadeOut();
+      });
+      </div>
+    </div>
   </div>