Update ebs-csi.adoc

Only PVs created from a storage class referencing the `ebs.csi.eks.amazonaws.com` can be mounted on EKS Auto mode nodes. Updated docs to make this more clear

Author: jenademoodley

latest/ug/storage/ebs-csi.adoc

@@ -27,7 +27,7 @@ The https://github.com/kubernetes-sigs/aws-ebs-csi-driver/[Amazon Elastic Block
 * You can run the Amazon EBS CSI controller on Fargate nodes, but the Amazon EBS CSI node [.noloc]`DaemonSet` can only run on Amazon EC2 instances.
 * Amazon EBS volumes and the Amazon EBS CSI driver are not compatible with Amazon EKS Hybrid Nodes.
 * Support will be provided for the latest add-on version and one prior version. Bugs or vulnerabilities found in the latest version will be backported to the previous release in a new minor version.
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+* Only PVs created from a Storage Class using `ebs.csi.eks.amazonaws.com` as the provisioner can be mounted on nodes created by EKS Auto mode. Existing PVs must be migrated to the new Storage Class using a volume snapshot.
 
 [IMPORTANT]
 ====
@@ -363,4 +363,4 @@ Alternatively, if you want a self-managed installation of the Amazon EBS CSI dri
 You can deploy a variety of sample apps and modify them as needed. For more information, see https://github.com/kubernetes-sigs/aws-ebs-csi-driver/tree/master/examples/kubernetes[Kubernetes Examples] on [.noloc]`GitHub`.
 
 
-📝 https://github.com/search?q=repo%3Aawsdocs%2Famazon-eks-user-guide+%5B%23ebs-csi%5D&type=code[Edit this page on GitHub]
+📝 https://github.com/search?q=repo%3Aawsdocs%2Famazon-eks-user-guide+%5B%23ebs-csi%5D&type=code[Edit this page on GitHub]