chore(compose): add docstring for new service arg

Author: balint-backmaker

compose/testcontainers/compose/__init__.py

@@ -17,6 +17,7 @@ class DockerCompose:
         pull: Pull images before launching environment.
         build: Build images referenced in the configuration file.
         env_file: Path to an env file containing environment variables to pass to docker compose.
+        services: The list of services to be run when starting this DockerCompose.
 
     Example: