I think we need to mention, either here or at the end of the section, that 

http://ajax.googleapis.com/ajax/libs/webfont/1/webfont.js

would get you the latest version of the library, and also mention what's explained [here](https://devsite.googleplex.com/fonts/docs/webfont_loader#Example):

"Alternatively one can link to a specific version of the WebFont Loader..."