Add instructions for `oc cluster up` on EC2
Add instructions for `oc cluster up` on EC2

When running on EC2 it is crucial to pass in the correct public hostname
and IPv4 so the cluster is functional and you can reach it from your
local host.

Signed-off-by: Steve Kuznetsov <a7da0fca91d9933d2725d731a48cabdc9e8ffd7a@redhat.com>

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