Update camera.adoc

Changed text note to Admonition.

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

@@ -8,7 +8,10 @@
 ifdef::env-github,env-browser[:outfilesuffix: .adoc]
 
 
-Note that by default, the mouse pointer is invisible, and the mouse is set up to control the camera rotation.
+[NOTE]
+====
+By default, the mouse pointer is invisible, and the mouse is set up to control the camera rotation.
+====
 
 
 == Default Camera