docs: fix clone howto issues from deep review

- destroy-clone: remove incorrect create-clone screenshot reference
- reset-clone: add --async flag example

https://claude.ai/code/session_011sPDgBjzL2N2X6jiYyoTjQ

Author: claude

docs/dblab-howtos/cloning/destroy-clone.md

@@ -13,7 +13,6 @@ A protected clone cannot be deleted automatically or manually. To delete it, fir
 
 ## GUI
 1. On the **Database Lab clone** page click the **Destroy** button.
-  ![DBLab Engine page / Create clone](/assets/guides/create-clone-1.png)
 1. Accept confirmation dialog and wait for it. You will be redirected to the **Database Lab instance** page.
 
 ## CLI

docs/dblab-howtos/cloning/reset-clone.md

@@ -44,5 +44,10 @@ dblab clone reset --snapshot-id SNAPSHOT_ID CLONE_ID
 The parameters `--latest` and `--snapshot-id` must not be specified at the same time.
 :::
 
+For long-running operations, use the `--async` flag:
+```bash
+dblab clone reset --async --latest CLONE_ID
+```
+
 ## Related
 - Guide: [Destroy a clone](/docs/dblab-howtos/cloning/destroy-clone)