Update timeout comment in unicorn example config.

Created by: caleywoods

The timeout was changed to 30 and the comment wasn't updated.

Also I've seen several reports of this timeout not being long enough for quite a few people. It resulted in me getting a 502 bad gateway from nginx until I upped it. Perhaps going back to the default 60 would be better? I changed mine to 300, running on an AWS micro instance.