correcting docs

spring-data-neo4j-examples/hello-worlds/README.md

@@ -1,10 +1,12 @@
 Hello Worlds
 ============
 
-A simple Spring Data Neo4j example with just enough code to
-do something that works.
+A simple Spring Data Neo4j example with just enough code to do something that works.
+
+See https://github.com/SpringSource/spring-data-neo4j/blob/master/spring-data-neo4j-examples/hello-worlds/src/test/java/org/springframework/data/neo4j/examples/hellograph/GalaxyServiceTest.java for example code.
 
 Build and Run
 -------------
 
-`mvn clean package exec:java`
+`mvn clean test`
+