The linked document does not describe "installing" but "configuring". It seems that the words "installing and" is not necessary. Instead, some detailed description for installing repositories for RHEL 8 would be necessary.

Reported by: rhn-support-mkawakam

https://access.redhat.com/documentation/en-us/red_hat_jboss_core_services/2.4.37/html-single/apache_http_server_installation_guide/index#annotations:d8da75f2-f845-41b1-a495-8ff72be5466c