fix(cmd): remove default port in cmd doc

Default is unset.

cmd/helm/helm.go

@@ -59,7 +59,7 @@ Common actions from this point include:
 
 Environment:
   $HELM_HOME      Set an alternative location for Helm files. By default, these are stored in ~/.helm
-  $HELM_HOST      Set an alternative Tiller host. The format is host:port (default ":44134").
+  $HELM_HOST      Set an alternative Tiller host. The format is host:port.
   $KUBECONFIG     Set an alternate Kubernetes configuration file (default: "~/.kube/config").
 `