Update custom_controls.adoc

src/docs/asciidoc/jme3/advanced/custom_controls.adoc

@@ -2,8 +2,8 @@
 :author: 
 :revnumber: 
 :revdate: 2016/03/17 20:48
-:relfileprefix: ../../:
-imagesdir: ../..
+:relfileprefix: ../../
+:imagesdir: ../..
 ifdef::env-github,env-browser[:outfilesuffix: .adoc]