Add a note on how to delete kubectl config user name (#13257)

content/en/docs/reference/kubectl/cheatsheet.md

@@ -58,18 +58,21 @@ kubectl config view # Show Merged kubeconfig settings.
 # use multiple kubeconfig files at the same time and view merged config
 KUBECONFIG=~/.kube/config:~/.kube/kubconfig2 kubectl config view
 
-# Get the password for the e2e user
+# get the password for the e2e user
 kubectl config view -o jsonpath='{.users[?(@.name == "e2e")].user.password}'
 
-kubectl config current-context              # Display the current-context
-kubectl config use-context my-cluster-name  # set the default context to my-cluster-name
+kubectl config view -o jsonpath='{.users[].name}'    # get a list of users
+kubectl config current-context			               # display the current-context
+kubectl config use-context my-cluster-name           # set the default context to my-cluster-name
 
 # add a new cluster to your kubeconf that supports basic auth
 kubectl config set-credentials kubeuser/foo.kubernetes.com --username=kubeuser --password=kubepassword
 
 # set a context utilizing a specific username and namespace.
 kubectl config set-context gce --user=cluster-admin --namespace=foo \
   && kubectl config use-context gce
+
+kubectl config unset users.foo                       # delete user foo
 ```
 
 ## Creating Objects

content/en/docs/tasks/access-application-cluster/configure-access-multiple-clusters.md

@@ -85,6 +85,10 @@ kubectl config --kubeconfig=config-demo set-credentials developer --client-certi
 kubectl config --kubeconfig=config-demo set-credentials experimenter --username=exp --password=some-password
 ```
 
+{{< note >}}
+To delete a user you can run `kubectl config unset users.<name>`
+{{< /note >}}
+
 Add context details to your configuration file:
 
 ```shell