Clarified bullet use.

src/docs/asciidoc/jme3/maven.adoc

@@ -27,6 +27,9 @@ The following artifacts are currently available (version `3.2.0-stable`):
 *  jme3-bullet-native-android - Native libraries needed for bullet (not jbullet) on android (beta)
 *  jme3-bullet-native - Native libraries needed for bullet (not jbullet) on desktop (beta)
 *  jme3-bullet - Physics support using native bullet, needs jme3-bullet-native or jme3-bullet-native-android (beta)
++
+NOTE: *Only one version of jme3-jbullet OR jme3-bullet can be used.*
+
 *  jme3-core - Core libraries needed for all jME3 projects
 *  jme3-desktop - Parts of the jME3 +++<abbr title="Application Programming Interface">API</abbr>+++ that are only compatible with desktop renderers, needed for image loading on desktop
 *  jme3-effects - Effects libraries for water and other post filters
@@ -38,7 +41,10 @@ The following artifacts are currently available (version `3.2.0-stable`):
 *  jme3-niftygui - NiftyGUI support for jME3 (Not available in JCenter)
 *  jme3-plugins - Loader plugins for OgreXML and jME-XML
 *  jme3-terrain - Terrain generation +++<abbr title="Application Programming Interface">API</abbr>+++
-*  jme3-jbullet - Physics support using jbullet (desktop only, not available in JCenter) *Only jme3-jbullet OR jme3-bullet can be used*
+*  jme3-jbullet - Physics support using jbullet (desktop only, not available in JCenter)
++
+NOTE: *Only one version of jme3-jbullet OR jme3-bullet can be used.*
+
 *  jme3-ios - iOS renderer for jME3 (Not available in JCenter)
 *  jme3-vr - New since jME3.2! Support for virtual reality. (Not available in JCenter)