fix(exapp_development): remove unneeded harp_frp_address flag for k8s

Signed-off-by: Edward Ly <contact@edward.ly>

Author: edward-ly

developer_manual/exapp_development/scaling/KubernetesSetup.rst

@@ -218,16 +218,10 @@ your container ID or name, and ``<GATEWAY_IP>`` with the gateway from
      "http" "<GATEWAY_IP>:8780" "http://nextcloud.local" \
      --harp \
      --harp_shared_key "some_very_secure_password" \
-     --harp_frp_address "<GATEWAY_IP>:8782" \
      --k8s \
      --k8s_expose_type=nodeport \
      --set-default
 
-.. note::
-
-   While the ``--harp_frp_address`` is a required argument for the ``docker`` command,
-   it is not used by Kubernetes at all.
-
 Verify:
 
 .. code:: bash