Merge pull request #9265 from openshift-cherrypick-robot/cherry-pick-9262-to-enterprise-3.7

[enterprise-3.7] Fixed an ifndef error

Author: mburke5678

dev_guide/managing_images.adoc

@@ -130,7 +130,7 @@ integrated registry, use `--reference-policy=local`. The registry uses the
 ifdef::openshift-origin,openshift-enterprise[]
 xref:../install_config/registry/extended_registry_configuration.adoc#middleware-repository-pullthrough[pull-through feature]
 endif::[]
-ifndef::openshift-origin+openshift-enterprise[]
+ifndef::openshift-origin,openshift-enterprise[]
 pull-through feature
 endif::[]
 to serve the image to the client. By default, the image blobs are