OSDOCS-13792:adding RN

Author: brendan-daly-red-hat

release_notes/ocp-4-19-release-notes.adoc

@@ -435,10 +435,15 @@ Starting in {product-title} 4.14, Extended Update Support (EUS) is extended to t
 === Installation and update
 
 [id="ocp-4-19-installation-and-update-remove-terraform-ibm-cloud_{context}"]
-==== Cluster API replaces Terraform for {ibm-cloud-title} installations
+==== Cluster API replaces Terraform on {ibm-cloud-title} installations
 
 In {product-title} {product-version}, the installation program uses the Cluster API instead of Terraform to provision cluster infrastructure during installations on {ibm-cloud-title}.
 
+[id="ocp-4-19-installation-and-update-remove-terraform-azure-stack-hub_{context}"]
+==== Cluster API replaces Terraform on {azure-first} Stack Hub installations
+
+In {product-title} {product-version}, the installation program uses the Cluster API instead of Terraform to provision clusters during installer-provisioned infrastructure installations on {azure-first} Stack Hub.
+
 [id="ocp-4-19-admin-ack-updating_{context}"]
 ==== Required administrator acknowledgment when updating from {product-title} 4.18 to 4.19