docs: add missing fires JSDoc annotations for upload file events (#11268)

Author: web-padawan

packages/upload/src/vaadin-upload-file.d.ts

@@ -96,6 +96,10 @@ export interface UploadFileEventMap extends HTMLElementEventMap, UploadFileCusto
  * `--vaadin-upload-file-warning-color`         |
  *
  * See [Styling Components](https://vaadin.com/docs/latest/styling/styling-components) documentation.
+ *
+ * @fires {CustomEvent} file-abort - Fired when the abort button is pressed.
+ * @fires {CustomEvent} file-retry - Fired when the retry button is pressed.
+ * @fires {CustomEvent} file-start - Fired when the start button is pressed.
  */
 declare class UploadFile extends UploadFileMixin(ThemableMixin(HTMLElement)) {
   addEventListener<K extends keyof UploadFileEventMap>(

packages/upload/src/vaadin-upload-file.js

@@ -77,6 +77,10 @@ import { UploadFileMixin } from './vaadin-upload-file-mixin.js';
  *
  * See [Styling Components](https://vaadin.com/docs/latest/styling/styling-components) documentation.
  *
+ * @fires {CustomEvent} file-abort - Fired when the abort button is pressed.
+ * @fires {CustomEvent} file-retry - Fired when the retry button is pressed.
+ * @fires {CustomEvent} file-start - Fired when the start button is pressed.
+ *
  * @customElement vaadin-upload-file
  * @extends HTMLElement
  * @mixes UploadFileMixin