Update README.md

Author: andyzhangx

deploy/example/nfs/README.md

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 ## NFS support
 [NFS 4.1 support for Azure Files](https://docs.microsoft.com/en-us/azure/storage/files/files-nfs-protocol) is optimized for random access workloads with in-place data updates and provides full POSIX file system support. This page shows how to use NFS feature by Azure File CSI driver on Azure Kubernetes cluster.
 - [Compare access to Azure Files, Blob Storage, and Azure NetApp Files with NFS](https://docs.microsoft.com/en-us/azure/storage/common/nfs-comparison)
-- [Encrypt in Transit(EiT) for NFS (Preview)](https://learn.microsoft.com/en-us/azure/storage/files/encryption-in-transit-for-nfs-shares) is now supported from CSI driver v1.33.0, by setting `encryptInTransit: "true"` in the storage class parameters, you can enable data encryption in transit for NFS Azure file volumes.
+- [Encrypt in Transit(EiT) for NFS (Preview)](https://learn.microsoft.com/en-us/azure/storage/files/encryption-in-transit-for-nfs-shares) is now supported from CSI driver v1.33.0, by setting `encryptInTransit: "true"` in the storage class parameters, you can enable data encryption in transit for NFS Azure file volumes. Please ensure that you have registered Encrypt in Transit (EiT) feature before proceeding.
 - supported OS: Linux
 
 #### Prerequisite