CNV-14447: Updated HCO version variable for 4.9.1

Author: Shikha Jhala

modules/virt-document-attributes.adoc

@@ -15,7 +15,7 @@
 ifndef::openshift-dedicated[]
 :VirtVersion: 4.9
 :KubeVirtVersion: v0.44.2
-:HCOVersion: 4.9.0
+:HCOVersion: 4.9.1
 endif::openshift-dedicated[]
 ifdef::openshift-dedicated[]
 :VirtVersion: 2.6