Apply suggestions from code review

Author: bene2k1

pages/kubernetes/how-to/use-sfs-with-kubernetes.mdx

@@ -47,7 +47,7 @@ The Scaleway File Storage CSI driver is preinstalled on Scaleway's managed Kuber
 </Message>
 
 <Message type="note">
-  This feature is currently in [Private Beta](https://www.scaleway.com/en/betas/), and available to selected testers only.
+  This feature is currently in [Private Beta](https://www.scaleway.com/en/betas/) and available to selected testers only. If you would like to sign up for the Private Beta to enable `ReadWriteMany`, fill out [this form](https://www.scaleway.com/en/betas/#file-storage).
 </Message>
 
 You can run the following command to check that the CSI driver pods are running: