docs: Framing Section: Refer to tokio_util::codec::Framed?

[leoshimo]

Q: Would it be valuable to refer readers to tokio_util::codec::Framed as part of the framing tutorial?

I don't feel the tutorial itself needs to be updated to use Framed. I've been using the read_buf + parse BufMut dance for framing so far, but felt breadcrumbs to tokio_util::codec may be valuable.

[Darksonn]

Having a note somewhere that tokio_util can be used instead makes sense to me.

[leoshimo]

Sounds great - I'll leave small note in framing.md section of tutorial