release-notes: Include note on Cawbird API key change

follow up to #140412

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

@@ -1613,6 +1613,16 @@ Superuser created successfully.
           </listitem>
         </itemizedlist>
       </listitem>
+      <listitem>
+        <para>
+          The <literal>cawbird</literal> Twitter client now uses its own
+          API keys to count as different application than upstream
+          builds. This is done to evade application-level rate limiting.
+          While existing accounts continue to work, users may want to
+          remove and re-register their account in the client to enjoy a
+          better user experience and benefit from this change.
+        </para>
+      </listitem>
     </itemizedlist>
   </section>
 </section>

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

@@ -462,3 +462,5 @@ In addition to numerous new and upgraded packages, this release has the followin
     - `virtualisation.libvirtd.qemu*` options (e.g.: `virtualisation.libvirtd.qemuRunAsRoot`) were moved to [`virtualisation.libvirtd.qemu`](options.html#opt-virtualisation.libvirtd.qemu) submodule,
     - software TPM1/TPM2 support (e.g.: Windows 11 guests) ([`virtualisation.libvirtd.qemu.swtpm`](options.html#opt-virtualisation.libvirtd.qemu.swtpm)),
     - custom OVMF package (e.g.: `pkgs.OVMFFull` with HTTP, CSM and Secure Boot support) ([`virtualisation.libvirtd.qemu.ovmf.package`](options.html#opt-virtualisation.libvirtd.qemu.ovmf.package)).
+
+- The `cawbird` Twitter client now uses its own API keys to count as different application than upstream builds. This is done to evade application-level rate limiting. While existing accounts continue to work, users may want to remove and re-register their account in the client to enjoy a better user experience and benefit from this change.