OCPBUGS#13279: Update the explanation of graph:true field

Author: xenolinux

modules/oc-mirror-creating-image-set-config.adoc

@@ -61,7 +61,7 @@ mirror:
 <2> Set the back-end location to save the image set metadata to. This location can be a registry or local directory. It is required to specify `storageConfig` values, unless you are using the Technology Preview OCI feature.
 <3> Set the registry URL for the storage backend.
 <4> Set the channel to retrieve the {product-title} images from.
-<5> Add `graph: true` to build and push the graph-data image to the mirror registry. The graph-data image is required to create OpenShift Update Service (OSUS) applications. The `graph: true` field also generates the `UpdateService` CR manifest. The `oc` command-line interface (CLI) can use the `UpdateService` CR manifest to create OSUS applications. For more information, see _About the OpenShift Update Service_.
+<5> Add `graph: true` to build and push the graph-data image to the mirror registry. The graph-data image is required to create OpenShift Update Service (OSUS). The `graph: true` field also generates the `UpdateService` custom resource manifest. The `oc` command-line interface (CLI) can use the `UpdateService` custom resource manifest to create OSUS. For more information, see _About the OpenShift Update Service_.
 <6> Set the Operator catalog to retrieve the {product-title} images from.
 <7> Specify only certain Operator packages to include in the image set. Remove this field to retrieve all packages in the catalog.
 <8> Specify only certain channels of the Operator packages to include in the image set. You must always include the default channel for the Operator package even if you do not use the bundles in that channel. You can find the default channel by running the following command: `oc mirror list operators --catalog=<catalog_name> --package=<package_name>`.