fix(k8s): fix cli command

Author: bene2k1

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

@@ -75,7 +75,7 @@ Alternatively, you can use the Scaleway CLI to perform the migration. Ensure the
 2. Run the migration command:
 
    ```bash
-   scw k8s cluster migrate-to-sbs-csi $CLUSTER_ID --region=$REGION
+   scw k8s cluster migrate-to-sbs-csi $CLUSTER_ID region=$REGION
    ```
 
    Replace `$REGION` and `$CLUSTER_ID` with your cluster’s region and ID, respectively.