Revert "Update data-fetching.md" (#27148)
Revert "Update data-fetching.md" (#27148)

Reverts vercel/next.js#27018 per comment https://github.com/vercel/next.js/pull/27018#issuecomment-877548891

JeromeFitz/next.js,azukaru/next.js,JeromeFitz/next.js,flybayer/next.js,azukaru/next.js,JeromeFitz/next.js,zeit/next.js,flybayer/next.js,azukaru/next.js,azukaru/next.js,zeit/next.js,zeit/next.js,JeromeFitz/next.js,flybayer/next.js,flybayer/next.js