shorten list topics

docs/modules/sdk/nav.adoc

@@ -13,21 +13,19 @@
 ****  link:http://www.youtube.com/watch?v=MNDiZ9YHIpM[Custom Controls]
 ****  link:http://www.youtube.com/watch?v=oZnssg8TBWQ[WebStart Deployment]
 ****  link:http://www.youtube.com/watch?v=D7JM4VMKqPc[Animation and Effect TrackEditing]
-
-** SDK User Guide
-*** Getting Started
-****  xref:update_center.adoc[Updating jMonkeyEngine SDK]
-****  xref:troubleshooting.adoc[Troubleshooting]
-*** Generic Java Development Features
-****  xref:project_creation.adoc[Project Creation]
-****  xref:code_editor.adoc[Code Editor and Palette]
-****  xref:version_control.adoc[File Version Control]
-****  xref:application_deployment.adoc[Application Deployment (JAR, WebStart, Applet, Android)]
-*****  xref:default_build_script.adoc[Default Build Script]
-*****  xref:ROOT:jme3/android.adoc[Android]
-*****  xref:ROOT:jme3/ios.adoc[iOS]
-****  xref:debugging_profiling_testing.adoc[Debugging, Profiling, Testing]
-*** Unique Game Development Features
+** Getting Started
+***  xref:update_center.adoc[Updating jMonkeyEngine SDK]
+***  xref:troubleshooting.adoc[Troubleshooting]
+** Generic Java Development Features
+***  xref:project_creation.adoc[Project Creation]
+***  xref:code_editor.adoc[Code Editor and Palette]
+***  xref:version_control.adoc[File Version Control]
+***  xref:application_deployment.adoc[Application Deployment (JAR, WebStart, Applet, Android)]
+****  xref:default_build_script.adoc[Default Build Script]
+****  xref:ROOT:jme3/android.adoc[Android]
+****  xref:ROOT:jme3/ios.adoc[iOS]
+***  xref:debugging_profiling_testing.adoc[Debugging, Profiling, Testing]
+** Unique Game Development Features
 
 *  <<sdk/model_loader_and_viewer#,Importing, Viewing, and Converting Models>>
 **  <<sdk/asset_packs#,Asset Packs>>