4180 - update claim notification for AO3 users

This update is to correct the instructions for updating a redirect: the user should delete the imported copy before contacting Open Doors.

https://code.google.com/p/otwarchive/issues/detail?id=4180

(Amended from previous SPR, closed due to commit SNAFU)
There's a space missing between the `)` and the `%` here: `<%= style_link('AO3 News', 'http://archiveofourown.org/admin_posts?tag=18')%>`