better minimal ubuntu server description

live-build/ubuntu-server/ubuntu-server-minimal.catalog-in.yaml

@@ -1,8 +1,7 @@
 name: "Ubuntu Server (minimized)"
 description: >-
   This version has been customized to have a small runtime footprint
-  in order to increase workload density in environments where humans
+  in environments where humans are not expected to log in
-  are not expected to log in.
 id: ubuntu-server-minimal
 type: fsimage
 variant: server