fix links

docs/modules/ROOT/pages/jme3/features.adoc

@@ -42,7 +42,7 @@ See also: xref:jme3/requirements.adoc[requirements].
 
 *  xref:physics/physics.adoc[Bullet physics binding]
 **  xref:physics:control/walking_character.adoc[Physical characters]
-**  xref:jme3/advanced/hinges_and_joints.adoc[Physical joints and hinges]
+**  xref:physics:joint/hinges_and_joints.adoc[Physical joints and hinges]
 **  xref:jme3/advanced/vehicles.adoc[Ray-cast vehicle]
 **  xref:jme3/advanced/ragdoll.adoc[Ragdoll physics]
 

docs/modules/tutorials/pages/concepts/faq.adoc

@@ -595,7 +595,7 @@ Use a PhysicsControl's hinges and joints.
 
 *Learn more:*
 
-* xref:ROOT:jme3/advanced/hinges_and_joints.adoc[Hinges and Joints]
+* xref:physics:joint/hinges_and_joints.adoc[Hinges and Joints]
 * link:https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/jme3-examples/src/main/java/jme3test/bullet/TestPhysicsHingeJoint.java[TestPhysicsHingeJoint.java] (Press HK keys to turn, spacebar to swing.)