fix links

docs/modules/ROOT/pages/jme3/advanced/shape.adoc

@@ -1,11 +1,8 @@
 = Shapes
 :author:
 :revnumber:
-:revdate: 2016/03/17 20:48
+:revdate: 2020/07/15
 :keywords: spatial, node, mesh, geometry, scenegraph
-:relfileprefix: ../../
-:imagesdir: ../..
-ifdef::env-github,env-browser[:outfilesuffix: .adoc]
 
 
 The simplest type of Meshes are the built-in JME Shapes. You can create Shapes without using the AssetManager.