Cinder now supports raw block volume

XRef: kubernetes/kubernetes#64879

Author: tengqm

content/en/docs/concepts/storage/persistent-volumes.md

@@ -528,17 +528,13 @@ applicable.
 
 * AWSElasticBlockStore
 * AzureDisk
+* Cinder
 * FC (Fibre Channel)
 * GCEPersistentDisk
 * iSCSI
 * Local volume
 * RBD (Ceph Block Device)
 
-{{< note >}}
-**Note**: Only FC and iSCSI volumes supported raw block volumes in Kubernetes 1.9.
-Support for the additional plugins was added in 1.10.
-{{< /note >}}
-
 ### Persistent Volumes using a Raw Block Volume
 ```yaml
 apiVersion: v1