nixos/doc: add release note entry for kea module

nixos/doc/manual/from_md/release-notes/rl-2111.section.xml

@@ -47,6 +47,13 @@
           <link xlink:href="options.html#opt-services.geoipupdate.enable">services.geoipupdate</link>.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          <link xlink:href="https://www.isc.org/kea/">Kea</link>, ISCs
+          2nd generation DHCP and DDNS server suite. Available at
+          <link xlink:href="options.html#opt-services.kea">services.kea</link>.
+        </para>
+      </listitem>
       <listitem>
         <para>
           <link xlink:href="https://sr.ht">sourcehut</link>, a

nixos/doc/manual/release-notes/rl-2111.section.md

@@ -15,6 +15,8 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - [geoipupdate](https://github.com/maxmind/geoipupdate), a GeoIP database updater from MaxMind. Available as [services.geoipupdate](options.html#opt-services.geoipupdate.enable).
 
+- [Kea](https://www.isc.org/kea/), ISCs 2nd generation DHCP and DDNS server suite. Available at [services.kea](options.html#opt-services.kea).
+
 - [sourcehut](https://sr.ht), a collection of tools useful for software development. Available as [services.sourcehut](options.html#opt-services.sourcehut.enable).
 
 - [ucarp](https://download.pureftpd.org/pub/ucarp/README), an userspace implementation of the Common Address Redundancy Protocol (CARP). Available as [networking.ucarp](options.html#opt-networking.ucarp.enable).