Update README.md

Author: andyzhangx

deploy/blobfuse-proxy/README.md

@@ -1,6 +1,6 @@
 # Blobfuse Proxy
  - supported CSI driver version: v1.6.0+
- - only available on **debian** based agent node
+ - only available on **debian** OS based agent node (not available on OpenShift)
 
 By default, restart csi-blobfuse-node daemonset would make current blobfuse mounts unavailable. When fuse nodeserver restarts on the node, the fuse daemon also restarts, this results in breaking all connections FUSE daemon is maintaining. You could find more details here: [No easy way how to update CSI driver that uses fuse](https://github.com/kubernetes/kubernetes/issues/70013).