fix issue

Author: RuimingShen

src/dom/dom.js

@@ -1,7 +1,7 @@
 /**
  * The web is much more than just canvas and the DOM functionality makes it easy to interact
  * with other HTML5 objects, including text, hyperlink, image, input, video,
- * , and webcam.
+ * audio, and webcam.
  * There is a set of creation methods, DOM manipulation methods, and
  * an extended <a href="#/p5.Element">p5.Element</a> that supports a range of HTML elements. See the
  * <a href='https://github.com/processing/p5.js/wiki/Beyond-the-canvas'>

src/image/pixels.js

@@ -864,7 +864,7 @@ function parseFilterArgs(...args) {
  *   // Get the entire canvas.
  *   let c = get();
  *
- *   // Display half the .
+ *   // Display half the canvas.
  *   image(c, 50, 0);
  *
  *   describe('Two identical mountain landscapes shown side-by-side.');