Table 2.1.2 - Network requirements for vSphere installation is broken. When you move mouse over the table it highlights relevant section, but the highlights look rather random. It looks like disco. 

https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html-single/installing_on_vmware_vsphere/index#installation-vsphere-installer-network-requirements_ipi-vsphere-installation-reqs

The same is for other sections line for any platform installation. Table 1.3.

https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html-single/installing_on_any_platform/index#installation-network-connectivity-user-infra_installing-platform-agnostic

Even though the tables show the same information they are different. It seems that there is something wrong with the second example.