`Microsoft.MachineLearningServices/workspaces/datastores` PUT body is not RPC-compliant

The PUT request body for this resource type uses `DatastoreCreateRequest`, which is not compliant as per the ARM RPC: https://github.com/Azure/azure-resource-manager-rpc/blob/master/v1.0/resource-api-reference.md#put-resource

https://github.com/Azure/azure-rest-api-specs/blob/88e7838a09868a51de3894114355c75929847a46/specification/machinelearningservices/resource-manager/Microsoft.MachineLearningServices/preview/2020-05-01-preview/machineLearningServices.json#L1992

Should these properties be inside "properties" as part of a resource body definition?

Note - the same issue may exist for other resources defined in this spec.

Start with the PUT resource definition around line 1992 of specification/machinelearningservices/resource-manager/Microsoft.MachineLearningServices/preview/2020-05-01-preview/machineLearningServices.json and compare it with the ARM RPC PUT resource reference. Check whether the same body shape occurs in other resources in this specification; done means the affected definitions follow the required properties wrapper.

Written by the indexing model from the issue text.