Example for Choice of type dict

For fine-tuning a deep neural network it would be amazing to choose not just a number of hidden layers but also the number of neurons per layer. The `Choice` module allows `Union[float, str, dict]` as input, so no arrays/ lists. Unfortunately, it comes without an example for input as a dict. How would that look?

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* ID: a9b67be3-1ef4-713c-ff2e-3d61d19b11f3
* Version Independent ID: b5941299-6e3d-e61e-297b-ec6d1d4c9d60
* Content: [azure.ai.ml.entities.Choice class - Azure Machine Learning Python](https://docs.microsoft.com/de-de/python/api/azure-ai-ml/azure.ai.ml.entities.choice?view=azure-ml-py)
* Content Source: [AzureML-Docset/stable/docs-ref-autogen/azure-ai-ml/azure.ai.ml.entities.Choice.yml](https://github.com/MicrosoftDocs/MachineLearning-Python-pr/blob/live/AzureML-Docset/stable/docs-ref-autogen/azure-ai-ml/azure.ai.ml.entities.Choice.yml)
* Service: **machine-learning**
* Sub-service: **core**
* GitHub Login: @DebFro
* Microsoft Alias: **debfro**