Include 123/udp port as a requirements for both UPI and IPI deployments

Document URL: https://docs.openshift.com/container-platform/4.5/installing/installing_vsphere/installing-restricted-networks-vsphere.html#installation-network-user-infra_installing-restricted-networks-vsphere

Section Number and Name: Networking requirements for user-provisioned infrastructure

Describe the issue: 123/udp port is missing from the required list of ports of IPI/UPI deployments.

Suggestions for improvement: 123/udp is required for both IPI and UPI deployments and should be included as part of the "Networking requirements for user-provisioned infrastructure" section of the documentation.