Update enabling assisted service topic

Author: amolnar-rh

modules/ztp-enabling-assisted-installer-service-on-bare-metal.adoc

@@ -26,21 +26,28 @@
 $ oc edit AgentServiceConfig
 ----
 
-. Add the following entry to the `items.spec.osImages` field in the CR:
+. Add the following entry to the `spec.osImages` field in the CR:
 +
 [source,yaml,subs="attributes+"]
 ----
-- cpuArchitecture: x86_64
-    openshiftVersion: "{product-version}"
-    rootFSUrl: https://<host>/<path>/rhcos-live-rootfs.x86_64.img
-    url: https://<host>/<path>/rhcos-live.x86_64.iso
+apiVersion: agent-install.openshift.io/v1beta1
+kind: AgentServiceConfig
+metadata:
+ name: agent
+spec:
+# ...
+  osImages:
+    - cpuArchitecture: x86_64
+      openshiftVersion: "{product-version}"
+      rootFSUrl: https://<host>/<path>/rhcos-live-rootfs.x86_64.img
+      url: https://<host>/<path>/rhcos-live.x86_64.iso
 ----
 +
 where:
 +
 --
-<host> :: Is the fully qualified domain name (FQDN) for the target mirror registry HTTP server.
-<path> :: Is the path to the image on the target mirror registry.
+<host> :: Specifies the fully qualified domain name (FQDN) for the target mirror registry HTTP server.
+<path> :: Specifies the path to the image on the target mirror registry.
 --
 +
-Save and quit the editor to apply the changes.
+Save and quit the editor to apply the changes.