wording tweaks
wording tweaks

* clarify what part of the function
* we share the unit tests
limzykenneth/p5.js,processing/p5.js,limzykenneth/p5.js,dhowe/p5.js,bomoko/p5.js,mlarghydracept/p5.js,mlarghydracept/p5.js,dhowe/p5.js,processing/p5.js,bomoko/p5.js