fix links

docs/modules/ROOT/pages/jme3/features.adoc

@@ -282,7 +282,7 @@ a|OGG Vorbis music and sounds
 
 *  xref:core:app/state/application_states.adoc[Application States] and xref:core:scene/control/custom_controls.adoc[Controls] to implement xref:jme3/advanced/update_loop.adoc[game logic]
 *  xref:core:cinematic/cinematics.adoc[Cinematics and motion paths]
-*  xref:jme3/advanced/camera.adoc[Camera System]
+*  xref:core:renderer/camera.adoc[Camera System]
 **  Normal or parallel view
 **  Multiple views
 

docs/modules/core/pages/app/simpleapplication.adoc

@@ -70,7 +70,7 @@ See: xref:jme3/intermediate/appsettings.adoc[AppSettings].
 
 a|cam +
 getCamera()
-a|The default xref:jme3/advanced/camera.adoc[camera] provides perspective projection, 45° field of view, near plane = 1 wu, far plane = 1000 wu.
+a|The default xref:renderer/camera.adoc[camera] provides perspective projection, 45° field of view, near plane = 1 wu, far plane = 1000 wu.
 
 a|assetManager +
 getAssetManager()

docs/modules/tutorials/pages/concepts/math.adoc

@@ -584,7 +584,7 @@ This gives us the general equation: (ax + by + cz + d = 0)
 
 jME defines the Plane as ax + by + cz = -d. Therefore, during creation of the plane, the normal of the plane (a,b,c) and the constant d is supplied.
 
-The most common usage of Plane is xref:ROOT:jme3/advanced/camera.adoc[Camera] frustum planes. Therefore, the primary purpose of Plane is to determine if a point is on the positive side, negative side, or intersecting a plane.
+The most common usage of Plane is xref:core:renderer/camera.adoc[Camera] frustum planes. Therefore, the primary purpose of Plane is to determine if a point is on the positive side, negative side, or intersecting a plane.
 
 Plane defines the constants:
 

docs/modules/tutorials/pages/concepts/the_scene_graph.adoc

@@ -1,6 +1,6 @@
 = The Scene Graph and Other jME3 Terminology
-:revnumber: 2.0
-:revdate: 2020/07/13
+:revnumber: 2.1
+:revdate: 2020/07/24
 :keywords: spatial, node, mesh, geometry, scenegraph, rootnode
 
 
@@ -152,4 +152,4 @@ Before you start creating your game, you should plan your scene graph: Which Nod
 
 *  xref:core/scene/spatial.adoc[Spatial] – More details about working with Nodes and Geometries
 *  xref:jme3/advanced/traverse_scenegraph.adoc[Traverse SceneGraph] – Find any Node or Geometry in the scenegraph.
-*  xref:jme3/advanced/camera.adoc[Camera] – Learn more about the Camera in the scene.
+*  xref:core:renderer/camera.adoc[Camera] – Learn more about the Camera in the scene.