Merge pull request #67427 from jeana-redhat/OSDOCS-8450-clarify-mhc-note

[OSDOCS-8450] Clarify note about MHC machine set requirement

Author: bscott-rh

modules/machine-health-checks-about.adoc

@@ -9,7 +9,7 @@
 
 [NOTE]
 ====
-You can only apply a machine health check to control plane machines on clusters that use control plane machine sets.
+You can only apply a machine health check to machines that are managed by compute machine sets or control plane machine sets.
 ====
 
 To monitor machine health, create a resource to define the configuration for a controller. Set a condition to check, such as staying in the `NotReady` status for five minutes or displaying a permanent condition in the node-problem-detector, and a label for the set of machines to monitor.

modules/machine-health-checks-creating.adoc

@@ -11,7 +11,7 @@ You can create a `MachineHealthCheck` resource for machine sets in your cluster.
 
 [NOTE]
 ====
-You can only apply a machine health check to control plane machines on clusters that use control plane machine sets.
+You can only apply a machine health check to machines that are managed by compute machine sets or control plane machine sets.
 ====
 
 .Prerequisites