details CSI migration

Author: louisportay

pages/kubernetes/api-cli/managing-storage.mdx

@@ -45,6 +45,8 @@ To identify your current CSI release version, navigate to the [Cockpit interface
   The Scaleway Block Volume Container Storage Interface (CSI) driver **v0.2** will reach its end of support on **February 28, 2025**.
 </Message>
 
+The migration moves volumes from Instances API to SBS API, no volume detach is expected, only a control-plane restart.
+
 ### Using the API with curl
 
 You can trigger the migration to SBS-CSI using the following `curl` command: