Remove reference to yqArg in pipeline tutorial
Remove reference to yqArg in pipeline tutorial

In the source yaml https://github.com/GoogleContainerTools/skaffold/blob/master/examples/microservices/leeroy-web/kubernetes/deployment.yaml the yaml file changed and removed the first yaml doc for service. 
this change makes the tutorial fail. removing reference to yqArg since deployment.yaml has only one document now.
tektoncd/pipeline,tektoncd/pipeline