OSSMDOC-594: update remove SMCP procedure to include SMRR

Author: rh-tokeefe

modules/ossm-control-plane-remove.adoc

@@ -39,6 +39,13 @@ You can remove the {SMProductName} control plane by using the CLI.  In this exam
 
 . Log in to the {product-title} CLI.
 
+. Run the following command to delete the `ServiceMeshMemberRoll` resource.
++
+[source,terminal]
+----
+$ oc delete smmr -n istio-system default
+----
+
 . Run this command to retrieve the name of the installed `ServiceMeshControlPlane`:
 +
 [source,terminal]