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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#### Document Details

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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**

開啟 AzureML-Docset/stable/docs-ref-autogen/azureml-core/azureml.data.data_reference.DataReference.yml，並找出 issue 中描述的 DataSets 連結。檢查連結的目的地並更新文件參照，使其不再回傳 404，然後確認轉譯後的 DataReference 頁面是否指向正確的 DataSets 文件。

由索引模型根據 Issue 內容生成。