Added a note that clusters with no worker nodes will not have CSRs to approve.

Signed-off-by: John Wilkins <[email protected]>

Author: johnwilkins

modules/dr-restoring-cluster-state.adoc

@@ -203,6 +203,11 @@ $ sudo systemctl restart kubelet.service
 .. Repeat this step on all other control plane hosts.
 
 . Approve the pending CSRs:
++
+[NOTE]
+====
+Clusters with no worker nodes, such as single-node clusters or clusters consisting of three schedulable control plane nodes, will not have any pending CSRs to approve. In those scenarios, you can skip this step.
+====
 
 .. Get the list of current CSRs:
 +