Update the example for kubectl port-forward

Clarify that `REMOTE_PORT` is interpreted as identifying a _Service_ port when provided `TYPE` is `service`.
Also, highlight support for specifying a named port as `REMOTE_PORT`.

Author: Christopher Montoro

staging/src/k8s.io/kubectl/docs/book/pages/container_debugging/port_forward_to_pods.md

@@ -41,6 +41,20 @@ kubectl port-forward deployment/mydeployment 5000 6000
 
 ---
 
+{% method %}
+## Pod in a Service
+
+Listen on port 8443 locally, forwarding to the targetPort of the service's port named "https" in a pod selected by the service
+{% sample lang="yaml" %}
+
+```bash
+kubectl port-forward service/myservice 8443:https
+```
+
+{% endmethod %}
+
+---
+
 {% method %}
 ## Different Local and Remote Ports
 

staging/src/k8s.io/kubectl/pkg/cmd/portforward/portforward.go

@@ -76,8 +76,8 @@ var (
 		# Listen on ports 5000 and 6000 locally, forwarding data to/from ports 5000 and 6000 in a pod selected by the deployment
 		kubectl port-forward deployment/mydeployment 5000 6000
 
-		# Listen on ports 5000 and 6000 locally, forwarding data to/from ports 5000 and 6000 in a pod selected by the service
-		kubectl port-forward service/myservice 5000 6000
+		# Listen on port 8443 locally, forwarding to the targetPort of the service's port named "https" in a pod selected by the service
+		kubectl port-forward service/myservice 8443:https
 
 		# Listen on port 8888 locally, forwarding to 5000 in the pod
 		kubectl port-forward pod/mypod 8888:5000