fix xref

docs/modules/tutorials/pages/intermediate/best_practices.adoc

@@ -192,7 +192,7 @@ Example: Players have *methods* such as `walk(), addGold(), getHealth(), pickUpI
 *Follow the Best Practice:* In general, use composition over inheritance and keep what an entity does (behaviour system) separate from what this entity is (attributes).
 
 *  Use `xref:ROOT:jme3/advanced/spatial.adoc[setUserData()]` to add custom attributes to Spatials.
-*  Use xref:ROOT:jme3/advanced/custom_control.adoc[Controls] and xref:ROOT:jme3/advanced/application_states.adoc[Application States] to define custom behaviour systems.
+*  Use xref:ROOT:jme3/advanced/custom_controls.adoc[Controls] and xref:ROOT:jme3/advanced/application_states.adoc[Application States] to define custom behaviour systems.
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