In the section Installing the Red Hat Openshift Logging Operator by using the CLI  in step 3 the following note is showed: "you must specify the openshift-logging namespace for logging versions 5.7 and older. For logging 5.8 and later versions, you can use any namespace".

This is true, but if the customer continues using openshift-logging namespace they cannot use the multi log forwarder feature . It should be fine to have in the same note the explanation or directly put in the comment that from 5.8 the customer can deploy the operator under openshift-logging namespace but the operator can also be deployed in a different namespace or in all namespaces due to multi log forwarder feature.