doc: Explain daemon(IO)NiceLevel removal in release note

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

@@ -1298,6 +1298,21 @@ Superuser created successfully.
           would be parsed as 3 parameters.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          <literal>nix.daemonNiceLevel</literal> and
+          <literal>nix.daemonIONiceLevel</literal> have been removed in
+          favour of the new options
+          <link xlink:href="options.html#opt-nix.daemonCPUSchedPolicy"><literal>nix.daemonCPUSchedPolicy</literal></link>,
+          <link xlink:href="options.html#opt-nix.daemonIOSchedClass"><literal>nix.daemonIOSchedClass</literal></link>
+          and
+          <link xlink:href="options.html#opt-nix.daemonIOSchedPriority"><literal>nix.daemonIOSchedPriority</literal></link>.
+          Please refer to the options documentation and the
+          <literal>sched(7)</literal> and
+          <literal>ioprio_set(2)</literal> man pages for guidance on how
+          to use them.
+        </para>
+      </listitem>
       <listitem>
         <para>
           The <literal>coursier</literal> package’s binary was renamed

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

@@ -388,6 +388,8 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - `boot.kernelParams` now only accepts one command line parameter per string. This change is aimed to reduce common mistakes like "param = 12", which would be parsed as 3 parameters.
 
+- `nix.daemonNiceLevel` and `nix.daemonIONiceLevel` have been removed in favour of the new options [`nix.daemonCPUSchedPolicy`](options.html#opt-nix.daemonCPUSchedPolicy), [`nix.daemonIOSchedClass`](options.html#opt-nix.daemonIOSchedClass) and [`nix.daemonIOSchedPriority`](options.html#opt-nix.daemonIOSchedPriority). Please refer to the options documentation and the `sched(7)` and `ioprio_set(2)` man pages for guidance on how to use them.
+
 - The `coursier` package's binary was renamed from `coursier` to `cs`. Completions which haven't worked for a while should now work with the renamed binary. To keep using `coursier`, you can create a shell alias.
 
 - The `services.mosquitto` module has been rewritten to support multiple listeners and per-listener configuration.