Update k8s201.md (#7777)

* Update k8s201.md

Change instructions to download yams files directly from the website (as used in other pages.)

Added instructions to delete labeled pod to avoid warnings in the subsequent deployment step.

* Update k8s201.md

Added example of using the exposed host from the a node running Kubernetes. (This works on AWS with Weave; not able to test it on other variations...)

docs/user-guide/walkthrough/k8s201.md

@@ -37,7 +37,7 @@ For example, here is the nginx Pod definition with labels ([pod-nginx-with-label
 Create the labeled Pod ([pod-nginx-with-label.yaml](/docs/user-guide/walkthrough/pod-nginx-with-label.yaml)):
 
 ```shell
-kubectl create -f docs/user-guide/walkthrough/pod-nginx-with-label.yaml
+kubectl create -f https://k8s.io/docs/user-guide/walkthrough/pod-nginx-with-label.yaml
 ```
 
 List all Pods with the label `app=nginx`:
@@ -46,6 +46,12 @@ List all Pods with the label `app=nginx`:
 kubectl get pods -l app=nginx
 ```
 
+Delete the Pod by label:
+
+```shell
+kubectl delete pod -l app=nginx
+```
+
 For more information, see [Labels](/docs/concepts/overview/working-with-objects/labels/).
 They are a core concept used by two additional Kubernetes building blocks: Deployments and Services.
 
@@ -67,10 +73,8 @@ Here is a Deployment that instantiates two nginx Pods:
 
 Create an nginx Deployment:
 
-Download the `deployment.yaml` above by clicking on the file name and copy to your local directory.
-
 ```shell
-kubectl create -f ./deployment.yaml
+kubectl create -f https://k8s.io/docs/user-guide/walkthrough/deployment.yaml
 ```
 
 List all Deployments:
@@ -90,10 +94,8 @@ contains the desired changes:
 
 {% include code.html language="yaml" file="deployment-update.yaml" ghlink="/docs/user-guide/walkthrough/deployment-update.yaml" %}
 
-Download ./deployment-update.yaml and copy to your local directory.
-
 ```shell
-kubectl apply -f ./deployment-update.yaml
+kubectl apply -f https://k8s.io/docs/user-guide/walkthrough//deployment-update.yaml
 ```
 
 Watch the Deployment create Pods with new names and delete the old Pods:
@@ -125,7 +127,7 @@ For example, here is a service that balances across the Pods created in the prev
 Create an nginx service ([service.yaml](/docs/user-guide/walkthrough/service.yaml)):
 
 ```shell
-kubectl create -f docs/user-guide/walkthrough/service.yaml
+kubectl create -f https://k8s.io/docs/user-guide/walkthrough/service.yaml
 ```
 
 List all services:
@@ -150,6 +152,14 @@ $ kubectl delete pod busybox # Clean up the pod we created with "kubectl run"
 {% endraw %}
 ```
 
+The service definition [exposed the Nginx Service](/docs/tasks/inject-data-application/downward-api-volume-expose-pod-information/) as port 8000 (`$SERVCE_PORT`). We can also access the service from a host running Kubernetes using that port:
+
+```shell
+wget -qO- http://$SERVICE_IP:$SERVICE_PORT # Run on a Kubernetes host
+```
+
+(This works on AWS with Weave.)
+
 To delete the service by name:
 
 ```shell