Remove GKE specific content from this page

#8262

content/en/docs/concepts/architecture/master-node-communication.md

@@ -90,12 +90,3 @@ connection will be encrypted, it will not provide any guarantees of integrity.
 These connections **are not currently safe** to run over untrusted and/or
 public networks.
 
-### SSH Tunnels
-
-[Google Kubernetes Engine](https://cloud.google.com/kubernetes-engine/) uses
-SSH tunnels to protect the Master -> Cluster communication paths. In this
-configuration, the apiserver initiates an SSH tunnel to each node in the
-cluster (connecting to the ssh server listening on port 22) and passes all
-traffic destined for a kubelet, node, pod, or service through the tunnel.
-This tunnel ensures that the traffic is not exposed outside of the private
-GCE network in which the cluster is running.