Merge pull request #1284 from toolness/yuidoc-fixes

Fix 'renderer' yuidoc param for createCanvas().

Author: Lauren McCarthy

src/core/rendering.js

@@ -25,7 +25,7 @@ var defaultId = 'defaultCanvas0'; // this gets set again in createCanvas
  * @method createCanvas
  * @param  {Number} w width of the canvas
  * @param  {Number} h height of the canvas
- * @param  optional:{String} renderer 'p2d' | 'webgl'
+ * @param  {String} [renderer] 'p2d' | 'webgl'
  * @return {Object} canvas generated
  * @example
  * <div>