doc: add signal to filehandle.writeFile() options

PR-URL: #56804
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Harshitha K P <harshitha014@gmail.com>

doc/api/fs.md

@@ -805,6 +805,7 @@ changes:
 * `options` {Object|string}
   * `encoding` {string|null} The expected character encoding when `data` is a
     string. **Default:** `'utf8'`
+  * `signal` {AbortSignal|undefined} allows aborting an in-progress writeFile. **Default:** `undefined`
 * Returns: {Promise}
 
 Asynchronously writes data to a file, replacing the file if it already exists.