Added caution block and resolved review comments

Author: sreeram-venkitesh

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

@@ -88,6 +88,10 @@ kubectl config --kubeconfig=config-demo set-cluster scratch --server=https://5.6
 
 Add user details to your configuration file:
 
+{{< caution >}}
+Storing passwords in Kubernetes client config is risky. A better alternative would be to use a credential plugin and store them separately. See: [client-go credential plugins](/docs/reference/access-authn-authz/authentication/#client-go-credential-plugins)
+{{< /caution >}}
+
 ```shell
 kubectl config --kubeconfig=config-demo set-credentials developer --client-certificate=fake-cert-file --client-key=fake-key-seefile
 kubectl config --kubeconfig=config-demo set-credentials experimenter --username=exp --password=some-password
@@ -153,6 +157,11 @@ users:
     client-key: fake-key-file
 - name: experimenter
   user:
+    # Documentation note (this comment is NOT part of the command output).
+    # Storing passwords in Kubernetes client config is risky.
+    # A better alternative would be to use a credential plugin
+    # and store the credentials separately.
+    # See https://kubernetes.io/docs/reference/access-authn-authz/authentication/#client-go-credential-plugins
     password: some-password
     username: exp
 ```