Expose pod rather than deploy after kubectl run

kubectl changed the way run created resources, it used to create a
deployment and pod, as of 1.18 it just creates a pod. To create a
deployment from the command line now is hard..

Signed-off-by: Alistair Hey <[email protected]>

Author: ah-f3

lab2.md

@@ -165,7 +165,7 @@ grafana
 Expose Grafana with a NodePort:
 
 ```sh
-kubectl -n openfaas expose deployment grafana \
+kubectl -n openfaas expose pod grafana \
 --type=NodePort \
 --name=grafana
 ```