Fix typo

I'm not sure at what point a typo is too small to warrant a pull request, but I do know I spent a non-zero amount of time determining that *getibute* was not, in fact, an arcane bit of JS jargon I needed to learn.

So here this is.

Note: The `endhighlight` non-change change appears to be an artifact of using the GitHub web interface to do the fork and edit. It first happened in iOS 7.11 Safari,. I then deleted my fork and started over in Windows 7 Firefox 29.0.1, but got the same result.