github/help.github.com — pull request #141 by alex-seville (2012-05-31 00:26:31+00:00)
Title: ssh url in forking code sample, instead of http url

I'd like to suggest using ssh-style referencing for the remote command in the code sample, since there is a strong chance that the reader will be forking for non-read-only purposes.

"For public repos you own or are a collaborator on, and all private repos, you must use a private ssh url like git@github.com:user/repo.git"

source: http://help.github.com/remotes/