typings: sync JSDoc with the actual implementation

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

Refs: nodejs#46933
PR-URL: nodejs#48853
Reviewed-By: Antoine du Hamel <[email protected]>
Reviewed-By: Deokjin Kim <[email protected]>

Author: illusi0n7

lib/internal/fs/promises.js

@@ -254,6 +254,9 @@ class FileHandle extends EventEmitterMixin(JSTransferable) {
   /**
    * @typedef {import('../webstreams/readablestream').ReadableStream
    * } ReadableStream
+   * @param {{
+   *   type?: string;
+   *   }} [options]
    * @returns {ReadableStream}
    */
   readableWebStream(options = kEmptyObject) {