[Hotfix] Lint for Documentation (#7817)

python/ray/util/sgd/torch/training_operator.py

@@ -22,6 +22,7 @@ try:
 except ImportError:
     pass
 
+
 def _is_multiple(component):
     """Checks if a component (optimizer, model, etc) is not singular."""
     return isinstance(component, collections.Iterable) and len(component) > 1