DOC Update v0.9 changelog (#544)

Author: frcaud

doc/whats_new/v0.9.rst

@@ -10,7 +10,6 @@ Changelog
 `ramp-database`
 ...............
 
-- Don't pre-select all users by default on the approval page :pr:`536`
 - Add `User.update_timestamp` database field :pr:`537`
 
 `ramp-engine`
@@ -20,8 +19,6 @@ Changelog
 `ramp-frontend`
 ...............
 
-- The list of users to approve are sorted by newest first :pr:`537`
-- Add a ``/manage_users`` admin page with a list of all users, and a search input :pr:`538`
 
 
 `ramp-utils`