Fix typos in article "Rendering Modes" and "Pomax's guide to Processing.js"

[lesmana]

article: http://processingjs.org/articles/RenderingModes.html

typo: langauge -> language

link typo:
http://processingjs.org/reference/articles/jsQuickStart.html#javascriptonlyprocessingcode
->
http://processingjs.org/articles/jsQuickStart.html#javascriptonlyprocessingcode

---

article: http://processingjs.org/articles/PomaxGuide.html

typo:

document.getElementById('ycoord').value = x;

->

document.getElementById('ycoord').value = y;