For what it's worth, the old title was something like "Github Introduces Two-Factor Auth", which is a lot more descriptive and informative than the shorter title. Would like to know why it was changed.
I'm going to go out on a limb and say because the domain name in quotation marks, taken with the headline, clearly indicates that it's on Github and about Two-Factor Auth.
Github repo's also use the sam (github.com) format, so it's very reasonable that one would think this was going to be a git repo on github for two-factor auth, not that github as a website has two-factor auth as a login feature.