Update p5.Renderer.js: clarify Android comment
Update p5.Renderer.js: clarify Android comment

Chrome for Android supports Object.assign, but the default Android browser from older versions of the OS does not.
dhowe/p5.js,nucliweb/p5.js,dhowe/p5.js,sakshamsaxena/p5.js,processing/p5.js,processing/p5.js,nucliweb/p5.js,kennethdmiller3/p5.js,mlarghydracept/p5.js,mlarghydracept/p5.js,kennethdmiller3/p5.js,limzykenneth/p5.js,bomoko/p5.js,sakshamsaxena/p5.js,joecridge/p5.js,limzykenneth/p5.js,bomoko/p5.js,joecridge/p5.js