add documentation

Author: dplewis

src/ParseQuery.js

@@ -1033,6 +1033,7 @@ class ParseQuery {
    *     be used for this request.
    *   <li>sessionToken: A valid session token, used for making a request on
    *       behalf of a specific user.
+   *   <li>json: Return raw json without converting to Parse.Object
    * </ul>
    * @returns {Promise} A promise that will be fulfilled once the
    *     iteration has completed.