[EXAMPLES] fix typo.

Author: Makoto Fukuhara <fukuo33@gmail.com>

Closes #4724 from fukuo33/fix-typo and squashes the following commits:

8c806b9 [Makoto Fukuhara] fix typo.

examples/src/main/scala/org/apache/spark/examples/BroadcastTest.scala

@@ -29,7 +29,7 @@ object BroadcastTest {
     val blockSize = if (args.length > 3) args(3) else "4096"
 
     val sparkConf = new SparkConf().setAppName("Broadcast Test")
-      .set("spark.broadcast.factory", s"org.apache.spark.broadcast.${bcName}BroaddcastFactory")
+      .set("spark.broadcast.factory", s"org.apache.spark.broadcast.${bcName}BroadcastFactory")
       .set("spark.broadcast.blockSize", blockSize)
     val sc = new SparkContext(sparkConf)