changed example boxes to be scrollable

i'm using chrome and can't scroll inside the example boxes on the website. the "client" example for the "acknowledgements" section contains a few comments,
but they're just cut off.

![socket-example](https://f.cloud.github.com/assets/71851/266712/9cd3771e-8e2d-11e2-8f83-a4a502286ab3.png)

so i suggest to either pull this fix or place the comments inside the box.

thanks for this awesome library!

cheers,
daniel