Documentation related to the EUS process has not been updated in 4.12. The content seems exactly the same as 4.11.

For example:

"The following procedure pauses all non-master MachineConfigPools and performs updates from OpenShift Container Platform 4.8 to 4.9 to 4.10"

https://docs.openshift.com/container-platform/4.12/updating/preparing-eus-eus-upgrade.html

4.12

N/A

N/A

Example:
"The following procedure pauses all non-master MachineConfigPools and performs updates from OpenShift Container Platform 4.8 to 4.9 to 4.10"

Example:
"The following procedure pauses all non-master MachineConfigPools and performs updates from OpenShift Container Platform 4.10 to 4.11 to 4.12"