Incorrect instructions for creating an OutputTabularDatasetConfig

The instructions for creating an OutputTabularDatasetConfig are as follows:

> You should not call this constructor directly, but instead should create a FileOutputDatasetConfig and then call the corresponding read_* methods to convert it into a OutputTabularDatasetConfig.

However there is no class named `FileOutputDatasetConfig`. The fact that `OutputFileDatasetConfig` doesn't have any direct `read_*` methods (you need to check the docs for `TransformationMixin` to see them) makes it even more confusing. Please update this to reflect the current state of the SDK

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* ID: d966b410-00cb-fd23-7a0f-5b817739e628
* Version Independent ID: 9278d9e0-268b-a3e6-447e-69e837a0fe66
* Content: [azureml.data.output_dataset_config.OutputTabularDatasetConfig class - Azure Machine Learning Python](https://docs.microsoft.com/en-us/python/api/azureml-core/azureml.data.output_dataset_config.outputtabulardatasetconfig?view=azure-ml-py)
* Content Source: [AzureML-Docset/stable/docs-ref-autogen/azureml-core/azureml.data.output_dataset_config.OutputTabularDatasetConfig.yml](https://github.com/MicrosoftDocs/MachineLearning-Python-pr/blob/live/AzureML-Docset/stable/docs-ref-autogen/azureml-core/azureml.data.output_dataset_config.OutputTabularDatasetConfig.yml)
* Service: **machine-learning**
* Sub-service: **core**
* GitHub Login: @DebFro
* Microsoft Alias: **debfro**