Description of problem:

Table located here has confusing documentation for `subnet` field: https://docs.openshift.com/container-platform/4.14/networking/multiple_networks/configuring-additional-network.html#configuration-ovnk-network-plugin-json-object_configuring-additional-network 

I spoke with the developer mduarted@redhat.com on slack here: https://redhat-internal.slack.com/archives/CFFSAHWHF/p1707942367639669?thread_ts=1706648560.856949&cid=CFFSAHWHF 

After back and forth discussion, I believe this points are important for user understanding of the config field:

• OVN-K manages IP assignment on behalf of the user. You cannot use external IPAM
• This can be any CIDR the user desires
• for layer2 topology, users can have duplicate CIDRs between NADs; this is because separate overlays are disconnected

I believe this clarifications are important for users based on my own experience trying to use and configure the feature for L2 network connectivity. Knowing definitively that I can use any CIDR I want and that I can even reuse CIDRs empowers me as a user.

Without that info, I am in the dark and just have to guess/hope that it works how I want it to, with no promise that it will.

I did not check official openshift docs outside of the 4.14 doc to see whether these changes need to be backported to other versions.