add links too new pages

docs/modules/ROOT/pages/jme3.adoc

@@ -9,8 +9,7 @@ ifdef::env-github,env-browser[:outfilesuffix: .adoc]
 
 === Managing Objects in the 3D Scene Graph
 
-**  <<jme3/advanced/3d_models#,3D Models>>
-**  <<jme3/advanced/custom_meshes#,Custom Meshes>>
+
 
 *  <<jme3/advanced/asset_manager#,Asset Manager>>
 *  <<jme3/advanced/save_and_load#,Saving and Loading Nodes (.J3O Files)>>

docs/modules/core/nav.adoc

@@ -14,4 +14,6 @@
 *** xref:scene/traverse_scenegraph.adoc.adoc[Traverse SceneGraph]
 *** xref:scene/spatial.adoc[Spatial: Node versus Geometry]
 *** xref:scene/mesh.adoc[Mesh]
+*** xref:custom_meshes.adoc[Custom Meshes]
 *** xref:scene/shape.adoc[Shape]
+*** xref:3d_models.adoc[3D Models]