fix sqlite arguments example

I noticed that otherwise the argument is not actually being forwarded

Author: kantord

docs/toolhive/guides-cli/filesystem-access.md

@@ -214,7 +214,7 @@ If you want to place the database file in a different location inside the
 container, use the server's `--db` flag to specify the new path:
 
 ```bash
-thv run --volume ~/my-database.db:/data/my-database.db sqlite --db /data/my-database.db
+thv run --volume ~/my-database.db:/data/my-database.db sqlite -- --db /data/my-database.db
 ```
 
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