RxQuery: point to Query docs for details.

Query docs have details on when new result list is emitted.

Author: greenrobot-team

objectbox-rxjava/src/main/java/io/objectbox/rx/RxQuery.java

@@ -85,7 +85,8 @@ public void cancel() throws Exception {
 
     /**
      * The returned Observable emits Query results as Lists.
-     * Never completes, so you will get updates when underlying data changes.
+     * Never completes, so you will get updates when underlying data changes
+     * (see {@link Query#subscribe()} for details).
      */
     public static <T> Observable<List<T>> observable(final Query<T> query) {
         return Observable.create(new ObservableOnSubscribe<List<T>>() {