[AutoPR cognitiveservices/data-plane/QnAMaker] Adding missing docs for existing routes for QnA Maker APIM#3393

AutorestCI merged 2 commits intorestapi_auto_cognitiveservices/data-plane/QnAMakerAzure/azure-sdk-for-js:restapi_auto_cognitiveservices/data-plane/QnAMakerfrom

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