Added eus channel info in updating a cluster using the web console section.

Author: subhtk

modules/update-upgrading-web.adoc

@@ -28,7 +28,7 @@ link:https://access.redhat.com/downloads/content/290[in the errata section] of t
 +
 [IMPORTANT]
 ====
-For production clusters, you must subscribe to a `stable-\*` or `fast-*` channel.
+For production clusters, you must subscribe to a `stable-\*`, `eus-*` or `fast-*` channel.
 ====
 ifdef::openshift-origin[]
 such as `stable-4`.
@@ -51,7 +51,7 @@ If you are upgrading your cluster to the next minor version, like version 4.y to
 --
 ** If updates are available, continue to perform updates in the current channel until you can no longer update.
 ifndef::openshift-origin[]
-** If no updates are available, change the *Channel* to the `stable-\*` or `fast-*` channel for the next minor version, and update to the version that you want in that channel.
+** If no updates are available, change the *Channel* to the `stable-\*`, `eus-*` or `fast-*` channel for the next minor version, and update to the version that you want in that channel.
 endif::openshift-origin[]
 ifdef::openshift-origin[]
 ** If no updates are available, change the *Channel* to the `stable-*` channel for the next minor version, and update to the version that you want in that channel.