changed admonition.

src/docs/asciidoc/jme3/simpleapplication_from_the_commandline.adoc

@@ -5,6 +5,7 @@
 :keywords: documentation, install
 :relfileprefix: ../
 :imagesdir: ..
+:experimental: 
 ifdef::env-github,env-browser[:outfilesuffix: .adoc]