Merge pull request #100790 from sjhala-ccs/cnv-70781

CNV-70781: Added note about GCP support limitation

Author: sjhala-ccs

virt/vm_networking/virt-networking-overview.adoc

@@ -35,7 +35,7 @@ image:darkcircle-7.png[20,20] Secondary VM networks are typically bridged direct
 
 [IMPORTANT]
 ====
-Connecting VMs directly to the underlay network is not supported on {product-rosa}, {azure-short} for {product-title}, or {oci-first}.
+Connecting VMs directly to the underlay network is not supported on {product-rosa}, {azure-short} for {product-title}, {gcp-first}, or {oci-first}.
 ====
 
 [NOTE]