text: Title: Update Katib Experiment Workflow Guide
  Body: ### What you would like to be added?
  
  We move this sequence diagram to [the Kubeflow Katib reference](https://www.kubeflow.org/docs/components/katib/reference/) guides: https://github.com/kubeflow/katib/blob/master/docs/workflow-design.md#what-happens-after-an-experiment-cr-is-created.
  
  After that, we should remove this doc from the Katib repository.
  
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