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* Improve "authenticating to k8s api from a pod" docs Helps with https://github.com/kubernetes/kubernetes/issues/22121. Also removing kubectl-container example as it's staged for removal and not very useful. Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com> * Address code review comments Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>