Use RHEL8 repos for RH Insights client

guides/common/modules/proc_registering-hosts.adoc

@@ -22,7 +22,7 @@ ifdef::satellite,orcharhino[]
 For more information, see {ContentManagementDocURL}Managing_Activation_Keys_content-management[Managing Activation Keys] in _{ContentManagementDocTitle}_.
 endif::[]
 ifdef::satellite[]
-* Optional: If you want to register hosts to Red{nbsp}Hat Insights, you must synchronize the `{RepoRHEL7Server}` repository and make it available in the activation key that you use.
+* Optional: If you want to register hosts to Red{nbsp}Hat Insights, you must synchronize the `{RepoRHEL8BaseOS}` and `{RepoRHEL8AppStream}` repositories and make them available in the activation key that you use.
 This is required to install the `insights-client` package on hosts.
 endif::[]
 * Optional: If you want to register hosts through {SmartProxy}, ensure that the *Registration* and *Templates* features are enabled on this {SmartProxy}.