Fixed a typo

Author: idreeshaddad

docs/templates/errorMessages.html

@@ -136,10 +136,10 @@ <h2 id="errors-defaults">App wide defaults</h2>
 
     // Override default error messages
     xtFormConfigProvider.setErrorMessages({
-        required 'Yo!, this will override the required message',
+        required: 'Yo!, this will override the required message',
         someOtherKey: 'Here is a message for a custom validation directive'
     });
 });
         </pre>
     </div>
-</div>
+</div>