Fix an error that was introduced in the text description

Fixes an error in the text that I think was introduced by @ntassone in https://github.com/heroku/identity/commit/99bdbcfd873d12229def896ff90f475687a27f5c#diff-429c6191a58c04ffb7c7a207ef68d59a 

(CC @raul )

PS. @raul this screen isn't in the /design
PPS.  Reported by @dmathieu - thanks.