Update modules/ROOT/pages/clustering/servers.adoc

Author: renetapopova

modules/ROOT/pages/clustering/servers.adoc

@@ -84,7 +84,11 @@ Once enabled, the server may be allocated databases to host.
 
 When a server is no longer needed, it cannot be removed from the cluster while it is still allocated to host any databases.
 The command `DEALLOCATE DATABASE[S] FROM SERVER[S] _server_[,...]` is used to transition servers to the _Deallocating_ state, reallocating all their hosted databases to other servers in the cluster.
-This is an irreversible state and servers which are deallocating will not have any further databases allocated to them.
+[WARNING]
+====
+This state is *irreversible*.
+Once a server is in a deallocating state, it subsequently cannot have databases allocated to it.
+====
 Note, if you wish to deallocate databases from a server in a reversible manner then see xref:clustering/databases.adoc#deallocate-databases[Deallocate databases] for more information.
 
 === Deallocated state