A little revise for the document

Author: soulmachine

docker/spark-test/README.md

@@ -3,7 +3,7 @@ Spark Docker files usable for testing and development purposes.
 These images are intended to be run like so:
 
 	docker run -v $SPARK_HOME:/opt/spark spark-test-master
-	docker run -v $SPARK_HOME:/opt/spark spark-test-worker <master_ip>
+	docker run -v $SPARK_HOME:/opt/spark spark-test-worker spark://<master_ip>:7077
 
 Using this configuration, the containers will have their Spark directories
 mounted to your actual `SPARK_HOME`, allowing you to modify and recompile