doc: fix helm chart install

Author: andyzhangx

charts/README.md

@@ -19,7 +19,7 @@
 ### install a specific version
 ```console
 helm repo add blob-csi-driver https://raw.githubusercontent.com/kubernetes-sigs/blob-csi-driver/master/charts
-helm install blob-csi-driver blob-csi-driver/blob-csi-driver --set node.enableBlobfuseProxy=true --namespace kube-system --version v1.25.1
+helm install blob-csi-driver blob-csi-driver/blob-csi-driver --set node.enableBlobfuseProxy=true --namespace kube-system --version 1.25.1
 ```
 
 ## install on Azure Stack