What is the status of NotebookRunnerStep?

[This question came up on SO](https://stackoverflow.com/questions/63866007/trigger-jupyter-notebook-in-azure-ml-workspace-from-adf/63878663#63878663​​​​​​​), and it made me think of `NotebookRunnerStep`. the SDK docs make no mention of `NotebookRunnerStep` but there is a demo notebook in this repo. Is that because the feature is still in public preview? If so, what's the roadmap to GA or inclusion in the main SDK (at least the docs?).

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#### Document Details

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* ID: 2cf9e3d1-b313-c997-eae8-6cab3bd2014a
* Version Independent ID: 0ef18191-46b9-6da0-0951-627a442c7d5e
* Content: [azureml.pipeline.steps package - Azure Machine Learning Python](https://docs.microsoft.com/en-us/python/api/azureml-pipeline-steps/azureml.pipeline.steps?view=azure-ml-py)
* Content Source: [AzureML-Docset/stable/docs-ref-autogen/azureml-pipeline-steps/azureml.pipeline.steps.yml](https://github.com/MicrosoftDocs/MachineLearning-Python-pr/blob/live/AzureML-Docset/stable/docs-ref-autogen/azureml-pipeline-steps/azureml.pipeline.steps.yml)
* Service: **machine-learning**
* Sub-service: **core**
* GitHub Login: @debfro
* Microsoft Alias: **debfro**

Issue にリンクされている NotebookRunnerStep デモノートブックと azureml.pipeline.steps リファレンスページから開始し、AzureML-Docset/stable/docs-ref-autogen/azureml.pipeline.steps.yml も確認してください。文書化された SDK サーフェスをデモおよびリンク先の Stack Overflow の質問と比較します。機能の preview ステータス、ロードマップ、ドキュメント化または組み込みに関する判断が明確に確立されれば完了です。

索引モデルが issue の本文から書いたものです。