Merge pull request openshift#10189 from gnufied/fix-controller-restart-docs

Update docs for controller-manager

Author: Traci Morrison

dev_guide/expanding_persistent_volumes.adoc

@@ -49,7 +49,7 @@ kubeletArguments:
 # systemctl restart atomic-openshift-node
 ----
 
-. Enable the `ExpandPersistentVolumes` feature gate on the master API:
+. Enable the `ExpandPersistentVolumes` feature gate on the master API and Controller-Manager:
 +
 ----
 # cat /etc/origin/master/master-config.yaml
@@ -61,6 +61,7 @@ kubernetesMasterConfig:
   - ExpandPersistentVolumes=true
 
 # systemctl restart atomic-openshift-master-api
+# systemctl restart atomic-openshift-master-controllers
 ----
 
 [[expanding_glusterfs_pvc]]