I'd make the link on the previous line simply be on 'Popolo' and this one go to http://popoloproject.com/specs/ itself. 

"Current" also raises the question here of versioning, as presumably it's possible for Popolo to add something that we don't cover here. They provide a change history at http://popoloproject.com/specs/#history but most of these don't seem to bump the version number. Maybe best to leave this until it actually becomes an issue?