message: update error code to use PascalCase to be syned with the library
diff: "code": {
  "type": "string",
  "enum": [
  - "invalidParameterValue",
  - "invalidRequestBodyFormat",
  - "emptyRequest",
  - "missingInputRecords",
  - "invalidDocument",
  - "modelVersionIncorrect",
  - "invalidDocumentBatch",
  - "unsupportedLanguageCode",
  - "invalidCountryHint"
  + "InvalidParameterValue",
  + "InvalidRequestBodyFormat",
  + "EmptyRequest",
  + "MissingInputRecords",
  + "InvalidDocument",
  + "ModelVersionIncorrect",
  + "InvalidDocumentBatch",
  + "UnsupportedLanguageCode",
  + "InvalidCountryHint"
  ],
  "x-ms-enum": {
  "name": "InnerErrorCodeValue",
  