Update link for ROSA service definition

Author: mletalie

modules/rosa-architecture.adoc

@@ -2,7 +2,7 @@
 = ROSA architecture on public and private networks
 
 You can install ROSA using either a public or private network. Configure a private cluster and private network connection during or after the cluster creation process.
-Red Hat manages the cluster with limited access through a public network. For more information, see the Service Definition.
+Red Hat manages the cluster with limited access through a public network. For more information, see xref:../../rosa_architecture/rosa_policy_service_definition/rosa-service-definition.adoc#rosa-service-definition[ROSA service definition].
 
 .ROSA deployed on public and private networks
 image::156_OpenShift_ROSA_Arch_0621_arch.svg[ROSA deployed on public and private networks]