docker: PEP8 compliancy and documentation changes (#32628)

This PR includes:
- PEP8 compliancy changes
- Documentation changes

lib/ansible/modules/cloud/google/gcspanner.py

@@ -192,7 +192,7 @@ def main():
             service_account_email=dict(type='str'),
             credentials_file=dict(type='str'),
             project_id=dict(type='str'),
-        ), 
+        ),
     )
 
     if not HAS_PYTHON26: