OCDOCS 62865 provide meaningful examples for NDP

Author: Michael Burke

modules/machine-config-node-disruption-config.adoc

@@ -58,7 +58,7 @@ spec:
       - restart:
           serviceName: crio.service
         type: Restart
-      name: test.service
+      name: sshd.service
 ----
 <1> Specifies the node disruption policy.
 <2> Specifies a list of machine config file definitions and actions to take to changes on those paths. This list supports a maximum of 50 entries.
@@ -117,7 +117,7 @@ status:
         - restart:
             serviceName: crio.service
           type: Restart
-        name: test.se
+        name: test.service
 # ...
 ----
 <1> Specifies the current cluster-validated policies.

modules/machine-config-node-disruption-example.adoc

@@ -73,7 +73,27 @@ status:
 
 The default node disruption policy does not contain a policy for changes to the `/etc/containers/registries.conf.d` file. This is because both {product-title} and {op-system-base-full} use the `registries.conf.d` file to specify aliases for image short names. It is recommended that you always pull an image by its fully-qualified name. This is particularly important with public registries, because the image might not deploy if the public registry requires authentication. You can create a user-defined policy to use with the `/etc/containers/registries.conf.d` file, if you need to use image short names.
 
-In the following example, when changes are made to the SSH keys, the MCO drains the cluster nodes, reloads the `crio.service`, reloads the systemd configuration, and restarts the `crio-service`.
+In the following example, when changes are made to the `registries.conf.d` file, the MCO restarts the `crio-service`.
+
+.Example node disruption policy for a change to the `registries.conf` file
+[source,yaml]
+----
+apiVersion: operator.openshift.io/v1
+kind: MachineConfiguration
+metadata:
+  name: cluster
+  namespace: openshift-machine-config-operator
+spec:
+  nodeDisruptionPolicy:
+    files:
+      - path: /etc/containers/registries.conf.d
+        actions:
+          - type: Restart
+          - restart:
+              serviceName: crio.service 
+----
+
+In the following example, when changes are made to the SSH keys, the MCO reloads the systemd configuration, and restarts the `crio-service`.
 
 .Example node disruption policy for an SSH key change
 [source,yaml]
@@ -87,14 +107,10 @@ spec:
   nodeDisruptionPolicy:
     sshkey:
       actions:
-      - type: Drain
-      - reload:
-          serviceName: crio.service
-        type: Reload
       - type: DaemonReload
       - restart:
           serviceName: crio.service
-        type: Restart
+        type: Restart 
 # ...
 ----
 
@@ -145,21 +161,3 @@ spec:
             restart:
               serviceName: crio.service
 ----
-
-In the following example, when changes are made to the `registries.conf` file, such as by editing an `ImageContentSourcePolicy` (ICSP) object, the MCO does not drain or reboot the nodes and applies the changes with no further action.
-
-.Example node disruption policy for a registries.conf file change
-[source,yaml]
-----
-apiVersion: operator.openshift.io/v1
-kind: MachineConfiguration
-metadata:
-  name: cluster
-# ...
-spec:
-  nodeDisruptionPolicy:
-    files:  
-      - actions:
-        - type: None
-        path: /etc/containers/registries.conf
-----

snippets/machine-config-node-disruption-actions.adoc

@@ -11,7 +11,7 @@ When you make any of these changes, the node disruption policy determines which
 * *Reload*: For services, the MCO reloads the specified services without restarting the service.
 * *Restart*: For services, the MCO fully restarts the specified services.
 * *DaemonReload*: The MCO reloads the systemd manager configuration.
-* *Special*: This is an internal MCO-only action and cannot be set by the user.
+* *Special*: This is an internal MCO-only action that is set by default for changes to the `/etc/containers/registries.conf` file. When this action is set, the MCO determines if a node cordon and drain is required, based on the changed content in the `registries.conf` file. You can override this default. However, it is not recommended to override this setting. You cannot set this action for another path or service.
 
 [NOTE]
 ====