Update creating_reading.js
Update creating_reading.js

changed the brightness() example comment to 50% instead of %50
dhowe/p5.js,limzykenneth/p5.js,mlarghydracept/p5.js,processing/p5.js,dhowe/p5.js,bomoko/p5.js,limzykenneth/p5.js,bomoko/p5.js,mlarghydracept/p5.js,processing/p5.js