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diff --git a/nixpkgs/nixos/doc/manual/from_md/development/replace-modules.section.xml b/nixpkgs/nixos/doc/manual/from_md/development/replace-modules.section.xml
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-<section xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="sec-replace-modules">
-  <title>Replace Modules</title>
-  <para>
-    Modules that are imported can also be disabled. The option
-    declarations, config implementation and the imports of a disabled
-    module will be ignored, allowing another to take it's place. This
-    can be used to import a set of modules from another channel while
-    keeping the rest of the system on a stable release.
-  </para>
-  <para>
-    <literal>disabledModules</literal> is a top level attribute like
-    <literal>imports</literal>, <literal>options</literal> and
-    <literal>config</literal>. It contains a list of modules that will
-    be disabled. This can either be the full path to the module or a
-    string with the filename relative to the modules path (eg.
-    &lt;nixpkgs/nixos/modules&gt; for nixos).
-  </para>
-  <para>
-    This example will replace the existing postgresql module with the
-    version defined in the nixos-unstable channel while keeping the rest
-    of the modules and packages from the original nixos channel. This
-    only overrides the module definition, this won't use postgresql from
-    nixos-unstable unless explicitly configured to do so.
-  </para>
-  <programlisting language="bash">
-{ config, lib, pkgs, ... }:
-
-{
-  disabledModules = [ &quot;services/databases/postgresql.nix&quot; ];
-
-  imports =
-    [ # Use postgresql service from nixos-unstable channel.
-      # sudo nix-channel --add https://nixos.org/channels/nixos-unstable nixos-unstable
-      &lt;nixos-unstable/nixos/modules/services/databases/postgresql.nix&gt;
-    ];
-
-  services.postgresql.enable = true;
-}
-</programlisting>
-  <para>
-    This example shows how to define a custom module as a replacement
-    for an existing module. Importing this module will disable the
-    original module without having to know it's implementation details.
-  </para>
-  <programlisting language="bash">
-{ config, lib, pkgs, ... }:
-
-with lib;
-
-let
-  cfg = config.programs.man;
-in
-
-{
-  disabledModules = [ &quot;services/programs/man.nix&quot; ];
-
-  options = {
-    programs.man.enable = mkOption {
-      type = types.bool;
-      default = true;
-      description = &quot;Whether to enable manual pages.&quot;;
-    };
-  };
-
-  config = mkIf cfg.enabled {
-    warnings = [ &quot;disabled manpages for production deployments.&quot; ];
-  };
-}
-</programlisting>
-</section>