fix typo in spanish translation of songs example in hello p5 section
fix typo in spanish translation of songs example in hello p5 section

processing/p5.js-website,lasyapriyanka/p5.js-website,chellyjin/p5.js-website,chellyjin/p5.js-website,processing/p5.js-website,lasyapriyanka/p5.js-website