Mention decomissioned *-2 dev desktops

Author: clubby789

src/infra/docs/dev-desktop.md

@@ -7,10 +7,19 @@ free access to high-powered cloud compute. They are part of the
 | Machine            | Architecture | Perf enabled | Location       |
 |--------------------|--------------|--------------|----------------|
 | `dev-desktop-eu-1` | `aarch64`    | Yes          | Germany        |
-| `dev-desktop-eu-2` | `amd64`      | No           | Netherlands    |
 | `dev-desktop-us-1` | `aarch64`    | Yes          | N. Virgina, US |
+
+#### Decomissioned Machines
+
+Previously, these machines were also available:
+
+| Machine            | Architecture | Perf enabled | Location       |
+|--------------------|--------------|--------------|----------------|
+| `dev-desktop-eu-2` | `amd64`      | No           | Netherlands    |
 | `dev-desktop-us-2` | `amd64`      | No           | Washington, US |
 
+They are currently being [decomissioned](https://rust-lang.zulipchat.com/#narrow/channel/242791-t-infra/topic/Shutting.20down.20dev-desktop-*-2.20instances).
+
 ## How to apply to the program
 
 At this time, access to the program and the compute instances is limited to