Fix comments in Demo that lead to 404 (#348)

Co-authored-by: dotasek <david.otasek@smilecdr.com>

src/test/java/ca/uhn/fhir/jpa/starter/Demo.java

@@ -15,6 +15,6 @@ public class Demo {
     System.setProperty("spring.batch.job.enabled", "false");
     SpringApplication.run(Demo.class, args);
 
-    //Server is now accessible at eg. http://localhost:8080/metadata
+    //Server is now accessible at eg. http://localhost:8080/fhir/metadata
   }
 }