CNV-12628: updating repo names for virt 4.8

Author: ousleyp

modules/virt-enabling-virt-repos.adoc

@@ -8,9 +8,9 @@
 Red Hat offers {VirtProductName} repositories for both Red Hat Enterprise Linux 8
 and Red Hat Enterprise Linux 7:
 
-* Red Hat Enterprise Linux 8 repository: `cnv-2.6-for-rhel-8-x86_64-rpms`
+* Red Hat Enterprise Linux 8 repository: `cnv-4.8-for-rhel-8-x86_64-rpms`
 
-* Red Hat Enterprise Linux 7 repository: `rhel-7-server-cnv-2.6-rpms`
+* Red Hat Enterprise Linux 7 repository: `rhel-7-server-cnv-4.8-rpms`
 
 The process for enabling the repository in `subscription-manager` is the same
 in both platforms.