[QnA Maker] Update examples in swagger docs (#8876)

* [QnA Maker] Update API data fields.

* camel casing

* initial commit

* spell check error

* prettier test fail

* prettier check

* prettier check test

* check prettier

* prettier test

* undo master changes

* update download and replace examples

* prettier check

* prettier run

* consistency with other variables.

Author: rokulka