Particularly the listed platforms are out of date:

ovirt is no longer supported (we should probably remove all docs)

ibm cloud is missing

powervs is missing

nutanix is missing

For any of the platforms that do not have internal docs we can link directly to the official docs. For example we can link to nutanix:

https://docs.openshift.com/container-platform/latest/installing/installing_nutanix/preparing-to-install-on-nutanix.html

Make sure to use <latest> instead of the version in the link