Update AWS EBS Migration Feature state (#16126)

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

@@ -151,14 +151,19 @@ spec:
 
 #### CSI Migration
 
-{{< feature-state for_k8s_version="v1.14" state="alpha" >}}
+{{< feature-state for_k8s_version="v1.17" state="beta" >}}
 
 The CSI Migration feature for awsElasticBlockStore, when enabled, shims all plugin operations
 from the existing in-tree plugin to the `ebs.csi.aws.com` Container
 Storage Interface (CSI) Driver. In order to use this feature, the [AWS EBS CSI
 Driver](https://github.com/kubernetes-sigs/aws-ebs-csi-driver)
 must be installed on the cluster and the `CSIMigration` and `CSIMigrationAWS`
-Alpha features must be enabled.
+Beta features must be enabled.
+
+#### CSI Migration Complete
+{{< feature-state for_k8s_version="v1.17" state="alpha" >}}
+
+To turn off the awsElasticBlockStore storage plugin from being loaded by controller manager and kubelet, you need to set this feature flag to true. This requires `ebs.csi.aws.com` Container Storage Interface (CSI) driver being installed on all worker nodes.
 
 ### azureDisk {#azuredisk}