ims_qos: fix dialog module name, dialog2 is not used anymore

src/modules/ims_qos/doc/ims_qos_admin.xml

@@ -29,7 +29,7 @@
 
       <itemizedlist>
         <listitem>
-          <para>Dialog2</para>
+          <para>Dialog</para>
         </listitem>
 
         <listitem>