nixos/release-notes: add calamares installer to highlights

nixos/doc/manual/from_md/release-notes/rl-2205.section.xml

@@ -108,6 +108,14 @@
           default.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          The GNOME and Plasma installation CDs now use
+          <literal>pkgs.calamares</literal> and
+          <literal>pkgs.calamares-nixos-extensions</literal> to allow
+          users to easily install and set up NixOS with a GUI.
+        </para>
+      </listitem>
     </itemizedlist>
   </section>
   <section xml:id="sec-release-22.05-new-services">

nixos/doc/manual/release-notes/rl-2205.section.md

@@ -35,6 +35,8 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - The default GHC version has been updated from 8.10.7 to 9.0.2. `pkgs.haskellPackages` and `pkgs.ghc` will now use this version by default.
 
+- The GNOME and Plasma installation CDs now use `pkgs.calamares` and `pkgs.calamares-nixos-extensions` to allow users to easily install and set up NixOS with a GUI.
+
 ## New Services {#sec-release-22.05-new-services}
 
 - [aesmd](https://github.com/intel/linux-sgx#install-the-intelr-sgx-psw), the Intel SGX Architectural Enclave Service Manager. Available as [services.aesmd](#opt-services.aesmd.enable).