Update data-fetching.md to use async file loading (#17518)
Update data-fetching.md to use async file loading (#17518)

Co-authored-by: Tim Neutkens <c2906527566e870efadc59ea5d0cd9114389a5d9@me.com>
JeromeFitz/next.js,zeit/next.js,flybayer/next.js,azukaru/next.js,zeit/next.js,JeromeFitz/next.js,JeromeFitz/next.js,flybayer/next.js,azukaru/next.js,azukaru/next.js,flybayer/next.js,zeit/next.js,azukaru/next.js,JeromeFitz/next.js,flybayer/next.js