doc: mention yarn hooks in release notes

nixos/doc/manual/release-notes/rl-2411.section.md

@@ -182,6 +182,8 @@
   The derivation now installs "impl" headers selectively instead of by a wildcard.
   Use `imgui.src` if you just want to access the unpacked sources.
 
+- The hooks `yarnConfigHook` and `yarnBuildHook` were added. These should replace `yarn2nix.mkYarnPackage` and other `yarn2nix` related tools. The motivation to get rid of `yarn2nix` tools is the fact that they are too complex and hard to maintain, and they rely upon too much Nix evaluation which is problematic if import-from-derivation is not allowed (see more details at [#296856](https://github.com/NixOS/nixpkgs/issues/296856). The transition from `mkYarnPackage` to `yarn{Config,Build}Hook` is tracked at [#324246](https://github.com/NixOS/nixpkgs/issues/324246).
+
 - Cinnamon has been updated to 6.2.
   - Following Mint 22 defaults, the Cinnamon module no longer ships geary and hexchat by default.
   - Nemo is now built with gtk-layer-shell support, note that for now it will be expected to see nemo-desktop