Proposal for this line and the adapted one in getting-started,html:
> Chat with fellow Bootstrappers using IRC on the `irc.freenode.net` server, in the [##twitter-bootstrap channel](irc://irc.freenode.net/#twitter-bootstrap).

The link is _actually_ irc://irc.freenode.net/#twitter-bootstrap (including the #), because the channel is "non-primary" and has two ##.