SPARK-6626 [DOCS]: Corrected Scala:TwitterUtils parameters

Per Sean Owen's request, here is the update call for TwitterUtils using Scala :)

Author: jayson <jayson@ziprecruiter.com>

Closes #5295 from JaysonSunshine/master and squashes the following commits:

df1d056 [jayson] Corrected Scala:TwitterUtils parameters

docs/streaming-programming-guide.md

@@ -704,7 +704,7 @@ create a DStream using data from Twitter's stream of tweets, you have to do the
 {% highlight scala %}
 import org.apache.spark.streaming.twitter._
 
-TwitterUtils.createStream(ssc)
+TwitterUtils.createStream(ssc, None)
 {% endhighlight %}
 </div>
 <div data-lang="java">