Merge pull request #74554 from jab-rh/OCPBUGS-17767

OCPBUGS-17767: Add warning about machine configs

Author: jab-rh

modules/nw-cluster-mtu-change.adoc

@@ -185,6 +185,11 @@ $ for manifest in control-plane-interface worker-interface; do
     butane --files-dir . $manifest.bu > $manifest.yaml
   done
 ----
++
+[WARNING]
+====
+Do not apply these machine configs until explicitly instructed later in this procedure. Applying these machine configs now causes a loss of stability for the cluster.
+====
 endif::local-zone,wavelength-zone,post-aws-zones,outposts[]
 
 . To begin the MTU migration, specify the migration configuration by entering the following command. The Machine Config Operator performs a rolling reboot of the nodes in the cluster in preparation for the MTU change.