[AutoPR cognitiveservices/data-plane/QnAMaker] Updated QnAMaker Runtime API headers descriptions#6457

AutorestCI merged 1 commit intorestapi_auto_cognitiveservices/data-plane/QnAMakerAzure/azure-sdk-for-python:restapi_auto_cognitiveservices/data-plane/QnAMakerfrom

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