Moved level 3 character title to level 2.

src/docs/asciidoc/jme3/advanced/jme3_ai.adoc

@@ -638,7 +638,7 @@ if (target != null) {
 
 before calling `computePath()` and the endpoint of the path will be moved to the closest cell to the `target` that's inside the `NavMesh`.
 
-=== Character Movement
+== Character Movement
 
 .NavigationControl update() loop
 [source, java]