nixos/earlyoom: mention extraArgs breakage and fix example

The shell-escaping breaks space handling and also makes the example
outdated. This breakage is missed in the previous change.

Also mention it in the release note.

nixos/doc/manual/release-notes/rl-2505.section.md

@@ -152,6 +152,10 @@
   access or want to access home directory via `killHook`, hardening setting can
   be changed via, e.g. `systemd.services.earlyoom.serviceConfig.ProtectSystem`.
 
+  `services.earlyoom.extraArgs` is now shell-escaped for each element without
+  word-breaking. So you want to write `extraArgs = [ "--prefer" "spaced pat" ]`
+  rather than previous `extraArgs = [ "--prefer 'spaced pat'" ]`.
+
 - `nodePackages.vls` has been deprecated, as the upstream consumer of it, vetur, has been deprecated by upstream. Upstream suggests migrating to Volar for Vue LSP tooling instead.
 
 - `nodePackages.create-react-native-app` has been removed, as it is deprecated. Upstream suggests using a framework for React Native apps instead.

nixos/modules/services/system/earlyoom.nix

@@ -139,9 +139,14 @@ in
       default = [ ];
       example = [
         "-g"
-        "--prefer '(^|/)(java|chromium)$'"
+        "--prefer"
+        "(^|/)(java|chromium)$"
       ];
-      description = "Extra command-line arguments to be passed to earlyoom.";
+      description = ''
+        Extra command-line arguments to be passed to earlyoom. Each element in
+        the value list will be escaped as an argument without further
+        word-breaking.
+      '';
     };
   };