fix links

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

@@ -268,7 +268,7 @@ a|OGG Vorbis music and sounds
 
 *  xref:core:terrain/terrain.adoc[Geomipmapped hightmap terrain]
 *  xref:tutorials:how-to/modeling/blender/blender_ogre_compatibility.adoc[Ogre Compatibility]
-*  xref:jme3/advanced/sky.adoc[SkyBox and SkyDome]
+*  xref:core:util/sky.adoc[SkyBox and SkyDome]
 *  Terrain lighting
 
 

docs/modules/core/pages/effect/water.adoc

@@ -45,7 +45,7 @@ image::effect/simplewater.png[simplewater.png,width="384",height="288",align="ri
 ..  Add a light source to the `scene` Spatial
 ..  Attach the `scene` Spatial to the `mainScene` Node
 
-.  Load your <<jme3/advanced/sky#,sky>> Geometry
+.  Load your xref:util/sky.adoc[sky] Geometry
 ..  Attach the sky Geometry to the `mainScene` Node
 
 .  Create the SimpleWaterProcessor `waterProcessor`

docs/modules/core/pages/material/materials_overview.adoc

@@ -1,6 +1,6 @@
 = Material Definition Properties
-:revnumber: 2.0
-:revdate: 2020/07/15
+:revnumber: 2.1
+:revdate: 2020/07/24
 :keywords: material, texture, MatDefs, light, culling, RenderStates, documentation
 
 
@@ -86,7 +86,7 @@ a| Usage
 Sky.j3md
 a| A solid sky blue, or use with a custom SkyDome texture.
 
-See also: xref:jme3/advanced/sky.adoc[Sky]
+See also: xref:util/sky.adoc[Sky]
 a| setTexture("`Texture`", assetManager.loadTexture("`name`")); +
 setBoolean("`SphereMap`",true); +
 setVector3("`NormalScale`", new Vector3f(0,0,0));

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

@@ -772,7 +772,7 @@ skyGeo.setQueueBucket(Bucket.Sky)
 
 *Learn more:*
 
-* xref:ROOT:jme3/advanced/sky.adoc[Sky]
+* xref:core:util/sky.adoc[Sky]
 
 
 == I want to access to back-end properties

docs/modules/tutorials/pages/how-to/modeling/blender/blender.adoc

@@ -458,5 +458,5 @@ This example uses a strange normalScale, this is to flip the image on the X-axis
 
 == Further reading
 
-*  xref:jme3/advanced/sky.adoc[How to add a Sky to your Scene]
+*  xref:core:util/sky.adoc[How to add a Sky to your Scene]
 *  link:http://hub.jmonkeyengine.org/t/jmonkeyengine-tutorial-how-to-create-skymaps-using-blender/19313[http://hub.jmonkeyengine.org/t/jmonkeyengine-tutorial-how-to-create-skymaps-using-blender/19313]