feat(ins): add information to vmware migration documentation

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

@@ -26,7 +26,8 @@ Identify the virtual machines (VMs) to migrate on your VMware platform:
 
 - Disk configuration (number, size, type)
   <Message type="tip">
-    If multiple disks are present, repeat the same steps to create several snapshots and group them as a single Scaleway image.
+    If multiple disks are present, follow the same steps to create individual snapshots and then combine them into a single Scaleway image.
+    For more detailed instructions on creating an image from multiple volumes, refer to documentation on [how to create an image from a snapshot](/instances/how-to/create-image-from-snapshot/).
   </Message>
 - Network configuration (number of NICs, type)
   <Message type="tip">
@@ -129,6 +130,13 @@ 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"
+    ```
+    Refer to the [CLI documentation](https://cli.scaleway.com/instance/#create-an-instance-image) for further information.
+  </Message>
 
 3. Create the server from the image:
   ```bash