Contradiction in Doc for compute_target

compute_target
Union[]
[Required] The compute target to use. If unspecified, the target from the runconfig will be used. This parameter may be specified as a compute target object or the string name of a compute target on the workspace. Optionally if the compute target is not available at pipeline creation time, you may specify a tuple of ('compute target name', 'compute target type') to avoid fetching the compute target object (AmlCompute type is 'AmlCompute' and RemoteCompute type is 'VirtualMachine').

PROBLEM: It's a [Required] parameter. So how could there be a note like 'If unspecified, the target of the runconfig will be used....'.
I tested it, if you do not specify it it fails, even with a runconfig which has a compute_target defined.

error: _executionId [453eac96]: Assignment for parameter Target is not specified_

So the doc is incorrect here.

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* ID: 76f6fde8-6396-f360-78c8-97970f5b0a4b
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* Content: [azureml.pipeline.steps.PythonScriptStep class - Azure Machine Learning Python](https://docs.microsoft.com/en-us/python/api/azureml-pipeline-steps/azureml.pipeline.steps.pythonscriptstep?view=azure-ml-py)
* Content Source: [AzureML-Docset/stable/docs-ref-autogen/azureml-pipeline-steps/azureml.pipeline.steps.PythonScriptStep.yml](https://github.com/MicrosoftDocs/MachineLearning-Python-pr/blob/live/AzureML-Docset/stable/docs-ref-autogen/azureml-pipeline-steps/azureml.pipeline.steps.PythonScriptStep.yml)
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