Remove English version on the Korean version of preparing_a_pull_request.md
Remove English version on the Korean version of preparing_a_pull_request.md

dhowe/p5.js,dhowe/p5.js,processing/p5.js,mlarghydracept/p5.js,limzykenneth/p5.js,processing/p5.js,mlarghydracept/p5.js,limzykenneth/p5.js