[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

model_zoo/extend_workflow_with_handler.md

@@ -71,7 +71,7 @@ class TimerHandler:
         self.start_time = 0
         self.epoch_start_time = 0
         self.iteration_start_time = 0
-         
+
     def attach(self, engine: Engine) -> None:
             engine.add_event_handler(Events.STARTED, self.started)
             engine.add_event_handler(Events.EPOCH_STARTED, self.epoch_started)