Retrievar microservice CURL command in ChatQnA example Readme for Xeon does not work.

[mandalrajiv]

In the Readme.md at https://github.com/opea-project/GenAIExamples/tree/main/ChatQnA/microservice/xeon, there is a Retriever Microservice curl command, the command given is: curl http://${host_ip}:7000/v1/retrieval\ -X POST \ -d '{"text":"What is the revenue of Nike in 2023?","embedding":${your_embedding}}' \ -H 'Content-Type: application/json'

The above command does not work, gives an error `{"detail":[{"type":"json_invalid","loc":["body",59],"msg":"JSON decode error","input":{},"ctx":{"error":"Expecting value"}}]}'

The correct format of the command should be as below. curl http://${host_ip}:7000/v1/retrieval \ -X POST \ -d '{"text":"What is the revenue of Nike in 2023?","embedding":"'"${your_embedding}"'"}' \ -H 'Content-Type: application/json'

[kding1]

You are expected to replace the ${your_embedding} with the actual value printed from the above code snippet in the readme. Basically it's 768 dimension 1-d array.