doc,src: update crypto/README.md

Refs: https://github.com/nodejs/node/pull/37048

PR-URL: https://github.com/nodejs/node/pull/40332


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Filip Skokan <panva.ip@gmail.com>
Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>
Reviewed-By: Qingyu Deng <i@ayase-lab.com>