nixos/rl-2111: mention changes to linux kernel infrastructure

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

@@ -708,6 +708,20 @@
   <section xml:id="sec-release-21.11-notable-changes">
     <title>Other Notable Changes</title>
     <itemizedlist>
+      <listitem>
+        <para>
+          The linux kernel package infrastructure was moved out of
+          <literal>all-packages.nix</literal>, and restructured. Linux
+          related functions and attributes now live under the
+          <literal>pkgs.linuxKernel</literal> attribute set. In
+          particular the versioned <literal>linuxPackages_*</literal>
+          package sets (such as <literal>linuxPackages_5_4</literal>)
+          and kernels from <literal>pkgs</literal> were moved there and
+          now live under <literal>pkgs.linuxKernel.packages.*</literal>.
+          The unversioned ones (such as
+          <literal>linuxPackages_latest</literal>) remain untouched.
+        </para>
+      </listitem>
       <listitem>
         <para>
           The setting

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

@@ -181,6 +181,9 @@ To be able to access the web UI this port needs to be opened in the firewall.
 
 ## Other Notable Changes {#sec-release-21.11-notable-changes}
 
+- The linux kernel package infrastructure was moved out of `all-packages.nix`, and restructured. Linux related functions and attributes now live under the `pkgs.linuxKernel` attribute set.
+  In particular the versioned `linuxPackages_*` package sets (such as `linuxPackages_5_4`) and kernels from `pkgs` were moved there and now live under `pkgs.linuxKernel.packages.*`. The unversioned ones (such as `linuxPackages_latest`) remain untouched.
+
 - The setting [`services.openssh.logLevel`](options.html#opt-services.openssh.logLevel) `"VERBOSE"` `"INFO"`. This brings NixOS in line with upstream and other Linux distributions, and reduces log spam on servers due to bruteforcing botnets.
 
   However, if [`services.fail2ban.enable`](options.html#opt-services.fail2ban.enable) is `true`, the `fail2ban` will override the verbosity to `"VERBOSE"`, so that `fail2ban` can observe the failed login attempts from the SSH logs.