fs: add the options param description in openAsBlob()

PR-URL: #49308
Refs: https://github.com/nodejs/node/blob/main/doc/api/fs.md#fsopenasblobpath-options
Reviewed-By: Deokjin Kim <deokjin81.kim@gmail.com>
Reviewed-By: LiviaMedeiros <livia@cirno.name>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

lib/fs.js

@@ -604,6 +604,9 @@ function openSync(path, flags, mode) {
 
 /**
  * @param {string | Buffer | URL } path
+ * @param {{
+ *   type?: string;
+ *   }} [options]
  * @returns {Promise<Blob>}
  */
 function openAsBlob(path, options = kEmptyObject) {