Link to DataSets is broken

The article mentions that DataReference is no longer the recommended approach and instead DataSets should be used, but the link to learn more about DataSets takes me to a 404 page (see pic below)

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* ID: 8b57ef22-d9c6-3066-9489-a368b354357a
* Version Independent ID: cffee3ba-8d7a-ce13-4975-825d8195081b
* Content: [azureml.data.data_reference.DataReference class - Azure Machine Learning Python](https://docs.microsoft.com/en-us/python/api/azureml-core/azureml.data.data_reference.datareference?preserve-view=true&view=azure-ml-py#feedback)
* Content Source: [AzureML-Docset/stable/docs-ref-autogen/azureml-core/azureml.data.data_reference.DataReference.yml](https://github.com/MicrosoftDocs/MachineLearning-Python-pr/blob/live/AzureML-Docset/stable/docs-ref-autogen/azureml-core/azureml.data.data_reference.DataReference.yml)
* Service: **machine-learning**
* Sub-service: **core**
* GitHub Login: @DebFro
* Microsoft Alias: **debfro**