[OKD] Incorrect link

There is a link at the end of the page https://docs.okd.io/latest/disconnected/mirroring/about-installing-oc-mirror-v2.html called [Updating a cluster in a disconnected environment using the OpenShift Update Service](https://docs.okd.io/latest/disconnected/updating/disconnected-update-osus.html#updating-disconnected-cluster-osus) This link doesn't work. MBurke: 4.17: The about-installing-oc-mirror-v2.adoc file is at: https://docs.okd.io/4.17/disconnected/mirroring/about-installing-oc-mirror-v2.html 4.18+: The about-installing-oc-mirror-v2.adoc file was moved up one level in 4.18. It is now: https://docs.okd.io/latest/disconnected/about-installing-oc-mirror-v2.html