Fetch a filtered list of user roles that the current user is allowed to edit.
Simple function whose main purpose is to allow filtering of the list of roles in the $wp_roles object so that plugins can remove inappropriate ones depending on the situation or user making edits. Specifically because without filtering anyone with the edit_users capability can edit others to be administrators, even if they are only editors or authors. This filter allows admins to delegate user management.
(array) Array of arrays containing role information.