Fix #2526
Fix #2526

Fixed a spelling mistake in the documentation for the filter method.
Gaussian was misspelled as 'Guassian'.
kennethdmiller3/p5.js,processing/p5.js,sakshamsaxena/p5.js,mlarghydracept/p5.js,processing/p5.js,nucliweb/p5.js,kennethdmiller3/p5.js,mlarghydracept/p5.js,dhowe/p5.js,limzykenneth/p5.js,limzykenneth/p5.js,nucliweb/p5.js,bomoko/p5.js,joecridge/p5.js,bomoko/p5.js,joecridge/p5.js,sakshamsaxena/p5.js,dhowe/p5.js