sdks/python: try to fix python doc linting issues

Author: mohamedawnallah

sdks/python/apache_beam/transforms/enrichment_handlers/cloudsql.py

@@ -260,7 +260,8 @@ def __init__(
       **kwargs,
   ):
     """
-    Example Usage:
+    Example usage::
+
       connection_config = CloudSQLConnectionConfig(
         db_adapter=DatabaseTypeAdapter.POSTGRESQL,
         instance_connection_uri="apache-beam-testing:us-central1:itests",