Some ability descriptions in this website don't make sense. They say the ability grants 0% of some stat. For instance, [the description of Sona's Song of Celerity](http://gameinfo.euw.leagueoflegends.com/en/game-info/champions/sona/) says "Grants Sona % movement speed for 7 seconds". This means that the ability does nothing at all, which obviously is not correct.
_Edited to make it more clear_