[AutoPR cognitiveservices/data-plane/QnAMaker] Adding missing docs for existing routes for QnA Maker APIM#4890

AutorestCI merged 4 commits intorestapi_auto_cognitiveservices/data-plane/QnAMakerAzure/azure-sdk-for-go:restapi_auto_cognitiveservices/data-plane/QnAMakerfrom

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