Update hello_animation.adoc

Fixed code format for tip under first exercise.

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

@@ -286,7 +286,9 @@ Make a mouse click trigger another animation sequence!
 Do you want to find out what animation sequences are available in the model? Use: 
 [source,java]
 ----
-for (String anim : control.getAnimationNames()) { System.out.println(anim); }
+for (String anim : control.getAnimationNames()) { 
+    System.out.println(anim); 
+}
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 ====