fix: add command for all-in-one binary

operate/meta-backup.mdx

@@ -25,7 +25,10 @@ Here's an example of how to create a new meta snapshot with `risectl`:
 risectl meta backup-meta
 ```
 
-`risectl` is included in the pre-built RisingWave binary. For details, see [Quick start](/get-started/quickstart#binaries).
+`risectl` is included in the pre-built RisingWave binary. Use the following command instead:
+```bash
+./risingwave ctl meta backup-meta
+```
 
 ## View existing meta snapshots