fix link

docs/modules/physics/pages/physics.adoc

@@ -289,7 +289,7 @@ a|Impacting projectiles, moving obstacles like crates, rolling and bouncing ball
 Solid immobile floors, walls, static obstacles.
 
 a|GhostControl
-a|Use for collision and intersection detection between physical objects. A GhostControl itself is _non-solid_ and invisible. GhostControl moves with the Spatial it is attached to. Use GhostControls to <<jme3/advanced/physics_listeners#,implement custom game interactions>> by adding it to a visible Geometry.
+a|Use for collision and intersection detection between physical objects. A GhostControl itself is _non-solid_ and invisible. GhostControl moves with the Spatial it is attached to. Use GhostControls to xref:collision/physics_listeners.adoc[implement custom game interactions] by adding it to a visible Geometry.
 a|A monster's “aggro radius, CharacterControl collisions, motion detectors, photo-electric alarm sensors, poisonous or radioactive perimeters, life-draining ghosts, etc.
 
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