typings: sync JSDoc with the actual implementation

JSDoc comment did not match the actual implementation of
`FileHandle#readableWebStream`.

Refs: nodejs/node#46933
PR-URL: nodejs/node#48853
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Deokjin Kim <deokjin81.kim@gmail.com>

graal-nodejs/lib/internal/fs/promises.js

@@ -248,6 +248,9 @@ class FileHandle extends EventEmitterMixin(JSTransferable) {
   /**
    * @typedef {import('../webstreams/readablestream').ReadableStream
    * } ReadableStream
+   * @param {{
+   *   type?: string;
+   *   }} [options]
    * @returns {ReadableStream}
    */
   readableWebStream(options = kEmptyObject) {