Update pytest_postgresql/config.py

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: fizyk

pytest_postgresql/config.py

@@ -28,7 +28,7 @@ class PostgreSQLConfig:
 
 
 def get_config(request: FixtureRequest) -> PostgreSQLConfig:
-    """Return a dictionary with config options."""
+    """Return a PostgreSQLConfig instance with configuration options."""
 
     def get_postgresql_option(option: str) -> Any:
         name = "postgresql_" + option