Description of problem:

I can not find anywhere in our doc the section where it says that the on-cluster registry is required. 

In ROSA/OSD, it's usually there by default. 

In OCP (self-managed), it's often not there by default. 

I checked in https://access.redhat.com/documentation/en-us/red_hat_openshift_data_science_self-managed/1.26/html/installing_openshift_data_science_self-managed/requirements-for-openshift-data-science-self-managed_install but could not find it. 

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