Undeploy command in helloworld-jdg quickstart is written wrong

https://github.com/jboss-developer/jboss-jdg-quickstarts/tree/jdg-6.5.x/helloworld-jdg

Command for undeploying archive from second eap server is written worng.

Actualy on page (doesn't work, application still accessible):
mvn jboss-as:undeploy -Ddeploy.port=10099

Should be (works):
mvn jboss-as:undeploy -Djboss-as.port=10099