Rename default docker-compose file

docker/docker-compose.postgresql.yml

@@ -32,8 +32,6 @@ version: "3.8"
 services:
     # Database service
     # Use PostgreSQL as the database backend
-    # Note: this can be changed to a different backend,
-    #       just make sure that you change the INVENTREE_DB_xxx vars below
     inventree-db:
         container_name: inventree-db
         image: postgres:13