Update website/docs/maintenance/backup_restore.md

Co-authored-by: Copilot <[email protected]>

Author: brianmay

website/docs/maintenance/backup_restore.md

@@ -50,8 +50,9 @@ CREATE EXTENSION earthdistance WITH SCHEMA public;
 
 # Restore
 Use the same filename that was used in the backup step.
+Replace `<backup_filename>` with the actual filename generated during the backup step (e.g., `teslamate_database_2025-05-07_07-33-48.sql`).
 
-docker compose exec -T database psql -U teslamate -d teslamate < teslamate_database_2025-05-07_07-33-48.sql
+docker compose exec -T database psql -U teslamate -d teslamate < <backup_filename>
 
 # Restart the teslamate container
 docker compose start teslamate