SPARK-1173. (#2) Fix typo in Java streaming example.

Companion commit to pull request alteryx#64, fix the typo on the Java side of the docs.

Author: Aaron Kimball <aaron@magnify.io>

Closes alteryx#65 from kimballa/spark-1173-java-doc-update and squashes the following commits:

8ce11d3 [Aaron Kimball] SPARK-1173. (#2) Fix typo in Java streaming example.

docs/streaming-programming-guide.md

@@ -188,7 +188,7 @@ JavaPairDStream<String, Integer> wordCounts = pairs.reduceByKey(
       return i1 + i2;
     }
   });
-wordCount.print();     // Print a few of the counts to the console
+wordCounts.print();     // Print a few of the counts to the console
 {% endhighlight %}
 
 The `words` DStream is further mapped (one-to-one transformation) to a DStream of `(word,