ARO networking pre-req : minimum CIDR doc is confusing

[ezYakaEagle442]

ARO Doc states:

• Pod CIDRs should be minimum /18 in size. (The pod network is nonroutable IPs, and is only used inside the OpenShift SDN.)
• Each node is allocated /23 subnet (512 IPs) for its pods. This value can't be changed.

so if the Pod CIDR is /23, it can not be /18, the way it is written is a bit confusing

Also why does it refer to OpenShift SDN whiich is supposed to be deprecated in favor of OVN-Kubernetes network plugin ?

https://learn.microsoft.com/en-us/azure/openshift/concepts-networking#networking-basics-in-openshift still refers to OpenShift Software Defined Networking (SDN) is used to configure an overlay network using Open vSwitch (OVS)
whereas https://learn.microsoft.com/en-us/azure/openshift/concepts-ovn-kubernetes#ovn-kubernetes-features states that Since version 4.11, OVN-Kubernetes has been the CNI for all new Azure Red Hat OpenShift clusters. For clusters created before then, migrating from the previous SDN standard to OVN is recommended. SDN has been deprecated since version 4.14 and will no longer be supported after version 4.16. You must migrate to OVN-Kubernetes prior to updating to 4.17.

Doc ref:

• https://learn.microsoft.com/en-us/azure/openshift/concepts-networking#networking-for-azure-red-hat-openshift
• https://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html/networking_overview/cidr-range-definitions