Merge pull request #45353 from darshan-nagaraj/OSDOCS-3433

OSDOCS-3433:Added EUS-EUS updates caveats

Author: stevsmit

updating/preparing-eus-eus-upgrade.adoc

@@ -18,6 +18,7 @@ There are a number of caveats to consider when attempting an EUS-to-EUS update.
 * You must be running at least {product-title} 4.8.14 before starting the EUS-to-EUS update procedure. If you do not meet this minimum requirement, update to a later 4.8.z before attempting the EUS-to-EUS update.
 * Support for RHEL7 workers was removed in {product-title} 4.10 and replaced with RHEL8 workers, therefore EUS-to-EUS updates are not available for clusters with RHEL7 workers.
 * Node components are not updated to {product-title} 4.9. Do not expect all features and bugs fixed in {product-title} 4.9 to be made available until you complete the update to {product-title} 4.10 and enable all MachineConfigPools to update.
+* EUS-to-EUS updates are not applicable to compact three-node clusters and Single Node Openshift (SNO) topologies because all of the hosts in these configurations are control plane hosts.
 
 
 include::modules/updating-eus-to-eus-upgrade.adoc[leveloffset=+1]