Joint: resolve 2 javadoc warnings

Author: stephengold

jme3-core/src/main/java/com/jme3/anim/Joint.java

@@ -167,7 +167,7 @@ private void updateAttachNode() {
      * have already been computed, otherwise this method will return undefined
      * results.
      *
-     * @param outTransform
+     * @param outTransform storage for the result (modified)
      */
     void getOffsetTransform(Matrix4f outTransform) {
         jointModelTransform.getOffsetTransform(outTransform, inverseModelBindMatrix);
@@ -358,6 +358,7 @@ public List<Joint> getChildren() {
      * @param jointIndex this bone's index in its armature (&ge;0)
      * @param targets    a list of geometries animated by this bone's skeleton (not
      *                   null, unaffected)
+     * @return the attachments node (not null)
      */
     Node getAttachmentsNode(int jointIndex, SafeArrayList<Geometry> targets) {
         targetGeometry = null;