I've been looking for something like that. It's not too reassuring to see the documentation not display code correctly (black on black text on Firefox?).
If that helps, console says it failed to load the following (but gave no reason):
>https://cdn.rawgit.com/google/code-prettify/master/loader/ru...
>https://cdn.rawgit.com/google/code-prettify/master/loader/la...
Maybe it's some cross-site loading being blocked, I dunno.