style: fix prettier formatting for postgres migration guide

docs/06-migration/03-postgres-major-version-upgrade.md

@@ -6,29 +6,34 @@ Upgrading PostgreSQL from version 13 to 15 is a major version jump. Since Postgr
 
 1. **Backup Existing Data (Version 13):**
    Before updating your compose file, ensure your containers are running and perform a dump of all databases.
+
    ```bash
    docker exec -it <project_name>-db-1 pg_dumpall -U postgres > full_dump.sql
    ```
 
 2. **Stop and Remove Containers:**
+
    ```bash
    docker compose down
    ```
 
 3. **Delete Old Data Volume:**
    PostgreSQL 15 cannot read data created by version 13. You must remove the existing volume (Warning: this deletes the old data directory).
+
    ```bash
    docker volume rm <project_name>_db-data
    ```
 
 4. **Update Image and Start (Version 15):**
    Update your `overrides/compose.postgres.yaml` (or pull the latest changes) and start the containers.
+
    ```bash
    docker compose up -d
    ```
 
 5. **Restore Data:**
    Restore the dump into the new PostgreSQL 15 instance.
+
    ```bash
    cat full_dump.sql | docker exec -i <project_name>-db-1 psql -U postgres
    ```