Update contributing guidelines for examples (#32584)
Update contributing guidelines for examples (#32584)

* Update contributing.md

* Apply suggestions from code review

Co-authored-by: Lee Robinson <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@leerob.io>

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