Description of problem:  A ocp 4.16 documentation: https://docs.redhat.com/en/documentation/openshift_container_platform/4.16/html/installing_on_any_platform/installing-platform-agnostic#installation-network-connectivity-user-infra_installing-platform-agnostic  describs to add certain UDP ports which were being used in sdn built cluster but currently not being used in OVN OpenShift cluster.  

 
4789 (VXLAN) port, this port is used in OpenShiftSDN clusters but not used in OVN-Kubernetes clusters.
The documentation also defines some ovn UDP 6081 geneve port in the SDN-based version which are again not being used in the sdn cluster.
Version-Release number of selected component (if applicable):

The OVN based documentations like 4.16 + have this port included as required.
The SDN based documentations like 4.12 have the geneve port 6081 included as required which is not the case for SDN clusters.

How reproducible: Use netstat command in the sdn and ovn based clusters to check if they are being used. 

Steps to Reproduce:

sh-5.1# netstat -tulnp | grep -i 4789

1. From 4.18 OVN based cluster version.

NO OUTPUT

2. From 4.12 SDN based cluster version.

sh-4.4# netstat -tulnp | grep -i 4789
udp        0      0 0.0.0.0:4789       0.0.0.0:*         -                   
udp6       0      0 :::4789                 :::*         -    

Actual results: The 4789 port is not being used in the OVN cluster.

Expected results: Actual result is same as expected result.

Additional info:

The 4.16.x + (OVN based) version don't use the VXLAN port. Hence, no need to mention them in the Network connectivity required port section. 

Affected Platforms:

• 4.16.x