ConstraintHelper#setReferencedIds correct return documentation (#396)

Author: vanniktech

constraintlayout/constraintlayout/src/main/java/androidx/constraintlayout/widget/ConstraintHelper.java

@@ -190,7 +190,6 @@ public int[] getReferencedIds() {
 
     /**
      * Helpers typically reference a collection of ids
-     * @return ids referenced
      */
     public void setReferencedIds(int[] ids) {
         mReferenceIds = null;