Merge pull request #80649 from wgabor0427/OCPBUGS-17177

OCPBUGS-17177: changed registrySource to registrySources

Author: mburke5678

modules/images-configuration-blocked-payload.adoc

@@ -48,7 +48,7 @@ $ oc edit image.config.openshift.io cluster
 [source,yaml]
 ----
 spec:
-  registrySource:
+  registrySources:
     blockedRegistries:
      - quay.io/openshift-payload
 ----