clarify the 2x10TB HDD drives are not required for new servers

tsa/howto/ganeti.mdwn

@@ -728,7 +728,9 @@ catastrophic data loss bug in Ganeti or [[drbd]].
   * Server: [PX62-NVMe][]
   * Location: `FSN1`
   * Operating system: Rescue
-  * Additional drives: 2x10TB HDD
+  * Additional drives: 2x10TB HDD (update: starting from fsn-node-05,
+    we are *not* ordering additional drives to save on costs, see
+    [ticket 33083](https://trac.torproject.org/projects/tor/ticket/33083) for rationale)
   * Add in the comment form that the server needs to be in the same
     datacenter as the other machines (FSN1-DC13, but double-check)