Update ISV registry 'name' field

Author: adellape

install_config/oab_broker_configuration.adoc

@@ -491,7 +491,7 @@ link:https://registry.connect.redhat.com[registry.connect.redhat.com].
 [source,yaml]
 ----
 registry:
-  - name: openshift
+  - name: isv
     type: openshift
     auth_type: config <1>
     user: <user>