Remove outdated Tails 3->4 guidance

docs/upgrade_to_tails_4.rst

@@ -1,19 +1,6 @@
 Upgrading workstations from Tails 3 to Tails 4
 ----------------------------------------------
 
-.. important::
-
-   Before upgrading your *Admin Workstation* and your *Journalist Workstation*
-   to Tails 4, you must first ensure that the version of the SecureDrop code on
-   the workstation (which is used for administrative tasks and for configuring
-   the Tails desktop) is at |version|.
-
-   If unsure, you can always run the ``git status`` command in the
-   ``~/Persistent/securedrop`` directory to determine the current version. If
-   the output is not  "HEAD detached at |version|", you are *not*
-   ready to proceed with the upgrade to Tails 4, and you must first update the
-   workstation using the procedure described in our upgrade guides.
-
 As a precaution, we recommend backing up your workstations before the upgrade
 to Tails 4. See our :doc:`Workstation Backup Guide <../backup_workstations>` for
 more information. We also recommend that you keep a USB drive running Tails 3.16
@@ -37,6 +24,7 @@ On the *Admin* and *Journalist Workstation* USBs, set an administrator password
 following commands: ::
 
   cd ~/Persistent/securedrop
+ ./securedrop-admin update
  ./securedrop-admin setup
  ./securedrop-admin tailsconfig
 
@@ -55,4 +43,3 @@ contact us using any of the methods below. If the upgrade failed and you need
 to restore from a backup, see our :ref:`guide for restoring workstations <restore_workstations>`.
 Make sure you restore to a Tails drive using Tails 3.16 before attempting
 another upgrade to Tails 4.
-