doc: change lang info string in fs JS snippets

Refs: nodejs/remark-preset-lint-node#176

PR-URL: #37605
Refs: #37162
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Danielle Adams <adamzdanielle@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

Author: aduh95