message: Callback parameter added to onUploadFiles event argument's description
diff: @@ -506,10 +506,14 @@ export class SurveyModel
  * The event is fired on uploading the file in QuestionFile when `storeDataAsText` is set to `false`. Use this event to change the uploaded file name or to prevent a particular file from being uploaded.
  * <br/> `sender` - the survey object that fires the event.
  * <br/> `options.question` - the file question instance.
  - * <br/> `options.name` - the file question name.
  + * <br/> `options.name` - the question name.
  * <br/> `options.files` - the Javascript File objects array to upload.
  + * <br/> `options.callback` - a callback function to get the file upload status and the updloaded file content.
  * @see uploadFiles
  * @see QuestionFileModel.storeDataAsText
  + * @see onDownloadFile
  + * @see onClearFiles
  + * @see [View Examples](https://www.google.com/search?q=site%3Ahttps%3A%2F%2Fsurveyjs.io%2FExamples%2F+%22onUploadFiles%22)
  */
  public onUploadFiles: Event<
  (sender: SurveyModel, options: any) => any,
  @@ -521,8 +525,11 @@ export class SurveyModel
  * <br/> `options.name` - the question name.
  * <br/> `options.content` - the file content.
  * <br/> `options.fileValue` - single file question value.
  - * <br/> `options.callback` - a call back function to get the status on downloading the file and the downloaded file content.
  + * <br/> `options.callback` - a callback function to get the file downloading status and the downloaded file content.
  * @see downloadFile
  + * @see onClearFiles
  + * @see onUploadFiles
  + * @see [View Examples](https://www.google.com/search?q=site%3Ahttps%3A%2F%2Fsurveyjs.io%2FExamples%2F+%22onDownloadFile%22)
  */
  public onDownloadFile: Event<
  (sender: SurveyModel, options: any) => any,
  @@ -535,8 +542,11 @@ export class SurveyModel
  * <br/> `options.name` - the question name.
  * <br/> `options.value` - the question value.
  * <br/> `options.fileName` - a removed file's name, set it to `null` to clear all files.
  - * <br/> `options.callback` - a call back function to get the status on clearing the files operation.
  + * <br/> `options.callback` - a callback function to get the operation status.
  * @see clearFiles
  + * @see onDownloadFile
  + * @see onUploadFiles
  + * @see [View Examples](https://www.google.com/search?q=site%3Ahttps%3A%2F%2Fsurveyjs.io%2FExamples%2F+%22onClearFiles%22)
  */
  public onClearFiles: Event<
  (sender: SurveyModel, options: any) => any,
  