Update docs for server-side code in GS(S)P props (#16198)
Update docs for server-side code in GS(S)P props (#16198)

Co-authored-by: Joe Haddad <9a59834641c3efaef8f42337ff0c7967b38f1c43@zeit.co>
JeromeFitz/next.js,flybayer/next.js,flybayer/next.js,azukaru/next.js,zeit/next.js,zeit/next.js,azukaru/next.js,flybayer/next.js,azukaru/next.js,JeromeFitz/next.js,zeit/next.js,JeromeFitz/next.js,flybayer/next.js,JeromeFitz/next.js,azukaru/next.js