Weihua Meng approved this change on the PR, and I've merged it. Thanks!
This change is live on docs.openshift: https://docs.openshift.com/container-platform/4.2/machine_management/adding-rhel-compute.html#rhel-preparing-node_adding-rhel-compute and on the portal: https://access.redhat.com/documentation/en-us/openshift_container_platform/4.2/html-single/machine_management/index#rhel-preparing-node_more-rhel-compute