Add caveat for kubectl in interconnect 2

Documentation may contain kubectl, introduce these instances with something like:

Because OpenShift Container Platform is a certified Kubernetes distribution, you can use the supported `kubectl` binaries that ship with OpenShift as described in this documentation, or you can use the `oc` binary.

reference: https://raw.githubusercontent.com/openshift/openshift-docs/master/cli_reference/openshift_cli/usage-oc-kubectl.adoc