Add step to chroot /host to reboot node

Author: mburke5678

modules/nodes-nodes-rebooting-gracefully.adoc

@@ -17,35 +17,44 @@ To perform a graceful restart of a node:
 ----
 $ oc adm cordon <node1>
 ----
-+
+
 . Drain the node to remove all the running pods:
 +
 [source,terminal]
 ----
 $ oc adm drain <node1> --ignore-daemonsets --delete-emptydir-data
 ----
-+
+
 . Access the node in debug mode:
 +
 [source,terminal]
 ----
 $ oc debug node/<node1>
 ----
+
+. Change your root directory to the host:
 +
+[source,terminal]
+----
+$ chroot /host
+----
+
 . Restart the node:
 +
 [source,terminal]
 ----
 $ systemctl reboot
 ----
 +
+In a moment, the node enters the `NotReady` state.
+
 . Mark the node as schedulable after the reboot is complete:
 +
 [source,terminal]
 ----
 $ oc adm uncordon <node1>
 ----
-+
+
 . Verify that the node is ready:
 +
 [source,terminal]