doc/release-notes: mention Lomiri availability

nixos/doc/manual/release-notes/rl-2405.section.md

@@ -74,6 +74,8 @@ Use `services.pipewire.extraConfig` or `services.pipewire.configPackages` for Pi
 
 - Plasma 6 is now available and can be installed with `services.xserver.desktopManager.plasma6.enable = true;`. Plasma 5 will likely be deprecated in the next release (24.11). Note that Plasma 6 runs as Wayland by default, and the X11 session needs to be explicitly selected if necessary.
 
+- The desktop mode of Lomiri (formerly known as Unity8), using Mir 2.x to function as a Wayland compositor, is now available and can be installed with `services.desktopManager.lomiri.enable = true`. Note that some core applications, services and indicators have yet to be packaged, and some functions may remain incomplete, but the base experience should be there.
+
 ## New Services {#sec-release-24.05-new-services}
 
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