Databricks scripts (not notebooks) should show reference on how to pass datasets

I took me several hours to realize they were being passed as a separate argument to the script... if there was a clear example AND clear documentation, that would short-circuit the time it took.

This is the only example we show of submitting a script...
https://github.com/Azure/MachineLearningNotebooks/blob/0c1fc2554267cd7cd7a9318acb1c94835f19a535/how-to-use-azureml/machine-learning-pipelines/intro-to-pipelines/databricks_train/train-db-local.py#L1-L5