DockerSection Class remarks section has a code sample that uses things that are deprecated

The remarks section for DockerSection Class contains a code snippet that uses deprecated statements, such as "docker.enabled = True". It would probably be best to fix this up to use the correct things given things like this are flagged as deprecated below

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#### Document Details

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* ID: f74ef100-d06b-b9c5-bbfb-78120ee794c5
* Version Independent ID: a0fdc0b6-3d00-2886-895f-7aa502aab668
* Content: [azureml.core.environment.DockerSection class - Azure Machine Learning Python](https://docs.microsoft.com/en-us/python/api/azureml-core/azureml.core.environment.dockersection?view=azure-ml-py)
* Content Source: [AzureML-Docset/stable/docs-ref-autogen/azureml-core/azureml.core.environment.DockerSection.yml](https://github.com/MicrosoftDocs/MachineLearning-Python-pr/blob/live/AzureML-Docset/stable/docs-ref-autogen/azureml-core/azureml.core.environment.DockerSection.yml)
* Service: **machine-learning**
* Sub-service: **core**
* GitHub Login: @DebFro
* Microsoft Alias: **debfro**