fixed missing version tag.

src/docs/asciidoc/jme3/beginner/hello_collision.adoc

@@ -120,6 +120,7 @@ public class HelloCollision extends SimpleApplication
     //Some methods used for setting gravity related variables were deprecated in
     //the 3.2 version of the engine. Choose the method that matches your version
     //of the engine.
+    // < jME3.2
     // player.setGravity(30f);
 
     // >= jME3.2
@@ -176,6 +177,7 @@ public class HelloCollision extends SimpleApplication
       //Some methods used for setting gravity related variables were deprecated in
       //the 3.2 version of the engine. Choose the method that matches your version
       //of the engine.
+      // < jME3.2
       //if (isPressed) { player.jump();}
 
       // >= jME3.2