Update next/image docs for relative parent with layout=fill. (#26615)
Update next/image docs for relative parent with layout=fill. (#26615)

https://github.com/vercel/next.js/discussions/18739#discussioncomment-435925
zeit/next.js,flybayer/next.js,azukaru/next.js,zeit/next.js,azukaru/next.js,flybayer/next.js,JeromeFitz/next.js,flybayer/next.js,zeit/next.js,flybayer/next.js,JeromeFitz/next.js,JeromeFitz/next.js,azukaru/next.js,azukaru/next.js,JeromeFitz/next.js