release notes: Mention consul breaking changes

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

@@ -79,6 +79,14 @@
           <literal>fetchConfigured = false;</literal>.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          <literal>consul</literal> was upgraded to a new major release
+          with breaking changes, see
+          <link xlink:href="https://github.com/hashicorp/consul/releases/tag/v1.10.0">upstream
+          changelog</link>.
+        </para>
+      </listitem>
       <listitem>
         <para>
           fsharp41 has been removed in preference to use the latest

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

@@ -26,6 +26,8 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - Those making use of `buildBazelPackage` will need to regenerate the fetch hashes (preferred), or set `fetchConfigured = false;`.
 
+- `consul` was upgraded to a new major release with breaking changes, see [upstream changelog](https://github.com/hashicorp/consul/releases/tag/v1.10.0).
+
 - fsharp41 has been removed in preference to use the latest dotnet-sdk
 
 - The following F#-related packages have been removed for being unmaintaned. Please use `fetchNuGet` for specific packages.