Update documentation of example to mention new client

wdtk-examples/src/main/java/org/wikidata/wdtk/examples/RdfSerializationExample.java

@@ -9,9 +9,9 @@
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -46,8 +46,9 @@
  * compressed output will be written into several files that will be placed in
  * the example directory.
  * <p>
- * In the future, this will probably become a stand-alone tool that can be
- * called directly.
+ * The Wikidata Toolkit command line client provides a stand-alone tool for
+ * generating RDF exports and it supports a range of parameters. This example is
+ * merely used to illustrate how to achieve this from your own code if needed.
  *
  * @author Michael Günther
  * @author Markus Kroetzsch