Need documentation on how to use Experiment vs. Run

[gvashishtha]

We have documentation on experiments and on runs, but no guidance in our "Concepts" section on how to decide whether something the user is doing is an experiment or a run.

[CESARDELATORRE]

That is kind of explained in this page: https://docs.microsoft.com/en-us/azure/machine-learning/concept-azure-machine-learning-architecture?view=azure-ml-py#experiments

However, that list of concepts looks to me a laundry list... I think we should have a more structured/hierarchical list of concepts, kind of a hierarchical taxonomy of concepts in that page.

I created a related DOCUMENTATION issue here: https://github.com/MicrosoftDocs/azure-docs/issues/46420