Update/fix restitution param desc in physics addons (#32341)

examples/jsm/physics/JoltPhysics.js

@@ -305,7 +305,7 @@ async function JoltPhysics() {
 		 * @name JoltPhysics#addMesh
 		 * @param {Mesh} mesh The mesh to add.
 		 * @param {number} [mass=0] The mass in kg of the mesh.
-		 * @param {number} [restitution=0] The restitution/friction of the mesh.
+		 * @param {number} [restitution=0] The restitution of the mesh, usually from 0 to 1. Represents how "bouncy" objects are when they collide with each other.
 		 */
 		addMesh: addMesh,
 

examples/jsm/physics/RapierPhysics.js

@@ -372,7 +372,7 @@ async function RapierPhysics() {
 		 * @name RapierPhysics#addMesh
 		 * @param {Mesh} mesh The mesh to add.
 		 * @param {number} [mass=0] The mass in kg of the mesh.
-		 * @param {number} [restitution=0] The restitution/friction of the mesh.
+		 * @param {number} [restitution=0] The restitution of the mesh, usually from 0 to 1. Represents how "bouncy" objects are when they collide with each other.
 		 */
 		addMesh: addMesh,