Changes to Retrieve a category

api tag Categories added

api tag Category removed

added the media type application/xml for the response with the status 200

added the media type application/xml for the response with the status 400

added the media type application/xml for the response with the status 401

added the media type application/xml for the response with the status 403

added the media type application/xml for the response with the status 404

added the media type application/xml for the response with the status 429

added the media type application/xml for the response with the status 503