CNV-28750: uncommenting RHEL 9 module

Author: ousleyp

virt/upgrading-virt.adoc

@@ -13,8 +13,7 @@ Learn how Operator Lifecycle Manager (OLM) delivers z-stream and minor version u
 Updating to {VirtProductName} 4.13 from {VirtProductName} 4.12.2 is not supported.
 ====
 
-// todo: uncomment when z-stream releases
-//include::modules/virt-rhel-9.adoc[leveloffset=+1]
+include::modules/virt-rhel-9.adoc[leveloffset=+1]
 
 include::modules/virt-about-upgrading-virt.adoc[leveloffset=+1]