rl-2211: document schleuder addition

nixos/doc/manual/from_md/release-notes/rl-2211.section.xml

@@ -71,6 +71,13 @@
           <link linkend="opt-services.persistent-evdev.enable">services.persistent-evdev</link>.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          <link xlink:href="https://schleuder.org/">schleuder</link>, a
+          mailing list manager with PGP support. Enable using
+          <link linkend="opt-services.schleuder.enable">services.schleuder</link>.
+        </para>
+      </listitem>
       <listitem>
         <para>
           <link xlink:href="https://www.expressvpn.com">expressvpn</link>,

nixos/doc/manual/release-notes/rl-2211.section.md

@@ -31,6 +31,8 @@ In addition to numerous new and upgraded packages, this release has the followin
   Available as [services.infnoise](options.html#opt-services.infnoise.enable).
 - [persistent-evdev](https://github.com/aiberia/persistent-evdev), a daemon to add virtual proxy devices that mirror a physical input device but persist even if the underlying hardware is hot-plugged. Available as [services.persistent-evdev](#opt-services.persistent-evdev.enable).
 
+- [schleuder](https://schleuder.org/), a mailing list manager with PGP support. Enable using [services.schleuder](#opt-services.schleuder.enable).
+
 - [expressvpn](https://www.expressvpn.com), the CLI client for ExpressVPN. Available as [services.expressvpn](#opt-services.expressvpn.enable).
 
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