feat(ins): add information

Author: bene2k1

pages/instances/reference-content/migrating-vms-vmware-scaleway.mdx

@@ -130,6 +130,12 @@ Upload the converted disk:
   ```bash
   scw instance image create snapshot-id=<snapshot-uuid> arch=x86_64
   ```
+  <Message type="note">
+    If your image consists of multiple snapshots, ensure you [specify them](/instances/how-to/create-image-from-snapshot/#creating-an-image-via-the-scaleway-cli) when creating the image:
+    ```bash
+    scw instance image create snapshot-id="$SCW_VOLUME_ID_1" additional-volumes.0.id="$SCW_VOLUME_ID_2" arch="x86_64"
+    ```
+  </Message>
 
 3. Create the server from the image:
   ```bash