remove disable caption

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

@@ -4,7 +4,6 @@
 :revdate: 2016/03/17 20:48
 :relfileprefix: ../../
 :imagesdir: ../..
-:figure-caption!:
 ifdef::env-github,env-browser[:outfilesuffix: .adoc]