Fix doc about NetworkWordCount/JavaNetworkWordCount usage of spark streaming

Usage: NetworkWordCount <master> <hostname> <port>
-->
Usage: NetworkWordCount <hostname> <port>

Usage: JavaNetworkWordCount <master> <hostname> <port>
-->
Usage: JavaNetworkWordCount <hostname> <port>

Author: jmu <[email protected]>

Closes apache#826 from jmu/master and squashes the following commits:

9fb7980 [jmu] Merge branch 'master' of https://github.com/jmu/spark
b9a6b02 [jmu] Fix doc for NetworkWordCount/JavaNetworkWordCount Usage: NetworkWordCount <master> <hostname> <port> --> Usage: NetworkWordCount <hostname> <port>

Author: jmu

docs/streaming-programming-guide.md

@@ -234,12 +234,12 @@ Then, in a different terminal, you can start the example by using
 <div class="codetabs">
 <div data-lang="scala" markdown="1">
 {% highlight bash %}
-$ ./bin/run-example org.apache.spark.examples.streaming.NetworkWordCount local[2] localhost 9999
+$ ./bin/run-example org.apache.spark.examples.streaming.NetworkWordCount localhost 9999
 {% endhighlight %}
 </div>
 <div data-lang="java" markdown="1">
 {% highlight bash %}
-$ ./bin/run-example org.apache.spark.examples.streaming.JavaNetworkWordCount local[2] localhost 9999
+$ ./bin/run-example org.apache.spark.examples.streaming.JavaNetworkWordCount localhost 9999
 {% endhighlight %}
 </div>
 </div>
@@ -268,7 +268,7 @@ hello world
 {% highlight bash %}
 # TERMINAL 2: RUNNING NetworkWordCount or JavaNetworkWordCount
 
-$ ./bin/run-example org.apache.spark.examples.streaming.NetworkWordCount local[2] localhost 9999
+$ ./bin/run-example org.apache.spark.examples.streaming.NetworkWordCount localhost 9999
 ...
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 Time: 1357008430000 ms