Fix link: ui.html -> menus.html

doc/index.docbook

@@ -540,8 +540,8 @@
 
 <para>
 Additionally &kajongg; has the common &kde; <guimenu>Settings</guimenu> and <guimenu>Help</guimenu>
-menu items, for more information read the sections about the <ulink url="help:/fundamentals/ui.html#menus-settings"
->Settings Menu</ulink> and <ulink url="help:/fundamentals/ui.html#menus-help">Help Menu</ulink>
+menu items, for more information read the sections about the <ulink url="help:/fundamentals/menus.html#menus-settings"
+>Settings Menu</ulink> and <ulink url="help:/fundamentals/menus.html#menus-help">Help Menu</ulink>
 of the &kde; Fundamentals.
 </para>