[AutoPR cognitiveservices/data-plane/LUIS/Authoring] Refactor enum list of /definitions/ReadableType#4638

AutorestCI merged 1 commit intorestapi_auto_cognitiveservices/data-plane/LUIS/AuthoringAzure/azure-sdk-for-go:restapi_auto_cognitiveservices/data-plane/LUIS/Authoringfrom

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