BZ1929998 - Clarify that EUS repos are available for all subs

Author: Bob

modules/understanding-upgrade-channels.adoc

@@ -66,6 +66,12 @@ Although there is no difference between `stable-4.y` and `eus-4.y` channels unti
 When upgrades to the next EUS channel are offered, you can switch to the next EUS channel and upgrade until you have reached the next EUS version.
 
 This upgrade process does not apply for the `eus-4.6` channel.
+
+[NOTE]
+====
+Both standard and non-EUS subscribers can access all EUS repositories and necessary RPMs (`rhel-*-eus-rpms`) to be able to support critical purposes such as debugging and building drivers.
+====
+
 endif::openshift-origin[]
 
 [id="upgrade-version-paths_{context}"]