add links to new tutorials

docs/modules/ROOT/pages/jme3.adoc

@@ -9,7 +9,6 @@ ifdef::env-github,env-browser[:outfilesuffix: .adoc]
 
 === Animations and Scenes
 
-*  <<jme3/external/3dsmax#,Creating compatible models in 3dsmax>>
 *  <<jme3/external/blender#,Creating jME3 compatible 3D models in Blender>>
 *  <<jme3/external/blender/blender_gltf#,Exporting Models as GlTF meshes from Blender>>
 *  <<jme3/external/blender/blender_ogre_export#,Exporting Models as Ogre XML meshes from Blender>>

docs/modules/tutorials/nav.adoc

@@ -25,3 +25,6 @@
 ** xref:intermediate/scenegraph_for_dummies.adoc[Scene Graph for Dummies]
 ** xref:intermediate/terminology.adoc[3D Graphics Terminology]
 ** xref:intermediate/transparency_sorting.adoc[Transparency Sorting]
+* How-to's
+** Modeling
+*** xref:advanced/modeling/3dsmax.adoc[Creating compatible models in 3dsmax]