add links to topics

docs/modules/ROOT/pages/jme3.adoc

@@ -9,7 +9,6 @@ ifdef::env-github,env-browser[:outfilesuffix: .adoc]
 
 === Graphical User Interface
 
-*  <<jme3/advanced/hud#,Head-Up Display (HUD)>>
 *  <<jme3/advanced/localization#,Localization>>
 *  <<jme3/advanced/swing_canvas#,Swing Canvas>>
 

docs/modules/core/nav.adoc

@@ -64,4 +64,5 @@
 *** Nifty GUI
 **** xref:gui/nifty_gui.adoc[Integration Tutorial]
 **** xref:gui/nifty_gui_best_practices.adoc[Best Practices]
-**** xref:gui/nifty_gui_scenarios.adoc[Scenarios (Load Screen etc)] 
+**** xref:gui/nifty_gui_scenarios.adoc[Scenarios (Load Screen etc)]
+*** xref:ui/hud.adoc[Head-Up Display (HUD)]