fix attributes and xrefs

docs/modules/sdk/pages/material_editing.adoc

@@ -1,16 +1,11 @@
 = jMonkeyEngine SDK: Material Editor
-:author:
-:revnumber:
-:revdate: 2016/03/17 20:48
+:revnumber: 2.0
+:revdate: 2020/07/10
 :keywords: documentation, sdk, material, file, texture
-:relfileprefix: ../
-:imagesdir: ..
-:experimental:
-ifdef::env-github,env-browser[:outfilesuffix: .adoc]
 
 
-If you are looking for background information, read about <<jme3/advanced/material_definitions#,Material Definitions>> and <<jme3/advanced/j3m_material_files#,j3M Material Files>>.
-You can <<jme3/advanced/j3m_material_files#,write .j3m files in a text editor>>, or use the jMonkeyEngine SDK to generate them for you as described in this article.
+If you are looking for background information, read about xref:ROOT:jme3/advanced/material_definitions.adoc[Material Definitions] and xref:ROOT:jme3/advanced/j3m_material_files.adoc[j3M Material Files].
+You can write .j3m files in a text editor, or use the jMonkeyEngine SDK to generate them for you as described in this article.
 
 
 == Materials
@@ -93,9 +88,7 @@ mywall.setMaterial(assetManager.loadMaterial( "Materials/mat_wall.j3m"));
 
 *See also:*
 
-*  <<jme3/advanced/material_specification#,Developer specification of the jME3 material system (.j3md,.j3m)>>
-*  <<jme3/beginner/hello_material#,Hello Material>>
-*  <<jme3/advanced/materials_overview#,Materials Overview>>
-*  <<jme3/advanced/material_definitions#,Material Definitions>>
-*  <<jme3/advanced/j3m_material_files#,j3M Material Files>>
-*  <<sdk/neotexture#,Neotexture>> (Procedural textures)
+*  xref:ROOT:jme3/advanced/material_specification.adoc[Developer specification of the jME3 material system (.j3md,.j3m)]
+*  xref:tutorials:beginner/hello_material.adoc[Hello Material]
+*  xref:ROOT:jme3/advanced/materials_overview.adoc[Materials Overview]
+*  xref:neotexture.adoc[Neotexture] (Procedural textures)