[ZF-5706]from "option fourth" to "optional fifth"

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@16101 44c647ce-9c0f-0410-b52a-842ac1e357ba

documentation/manual/en/module_specs/Zend_Dojo-View-Helpers.xml

@@ -916,7 +916,7 @@ echo $view->passwordTextBox(
                 </para>
 
                 <para>
-                    RadioButton accepts an option fourth argument,
+                    RadioButton accepts an optional fifth argument,
                     <code>$options</code>, an associative array of value/label
                     pairs used as the radio options. You may also pass these as
                     the <code>$attribs</code> key <code>options</code>.