Merge pull request #118773 from peterhoeg/doc/packagekit

document packagekit changes

nixos/doc/manual/release-notes/rl-2105.xml

···
      further details.
     </para>
    </listitem>
+   <listitem>
+    <para>
+     The <option>services.packagekit.backend</option> option has been removed as
+     it only supported a single setting which would always be the default.
+     Instead new <link
+     xlink:href="https://github.com/NixOS/rfcs/blob/master/rfcs/0042-config-option.md">RFC
+     0042</link> compliant <xref linkend="opt-services.packagekit.settings"/>
+     and <xref linkend="opt-services.packagekit.vendorSettings"/> options have
+     been introduced.
+    </para>
+   </listitem>
   </itemizedlist>
  </section>