[SPARK-5058] Part 2. Typos and broken URL

- Also fixed java link

Author: Jongyoul Lee <jongyoul@gmail.com>

Closes #4172 from jongyoul/SPARK-FIXDOC and squashes the following commits:

6be03e5 [Jongyoul Lee] [SPARK-5058] Part 2. Typos and broken URL - Also fixed java link

docs/streaming-kafka-integration.md

@@ -29,7 +29,7 @@ title: Spark Streaming + Kafka Integration Guide
         	streamingContext, [zookeeperQuorum], [group id of the consumer], [per-topic number of Kafka partitions to consume]);
 
 	See the [API docs](api/java/index.html?org/apache/spark/streaming/kafka/KafkaUtils.html)
-	and the [example]({{site.SPARK_GITHUB_URL}}/tree/master/examples/src/main/java/org/apache/spark/examples/streaming/JavaKafkaWordCount.java).
+	and the [example]({{site.SPARK_GITHUB_URL}}/blob/master/examples/scala-2.10/src/main/java/org/apache/spark/examples/streaming/JavaKafkaWordCount.java).
 	</div>
 	</div>