As redhat-support-tool will not be shipped in RHEL 9 (and onwards), the mentions of the same should be removed from OCP 4.13+ docs, as OCP 4.13+ is based on RHEL 9.2
(https://access.redhat.com/documentation/en-us/openshift_container_platform/4.15/html/support/support-overview).
Next steps is to create a Doc bug Jira for this. 

cc: rhn-support-rkale, rhn-support-pghole