nixos docs: format =)

nixos/doc/manual/development/meta-attributes.xml

@@ -3,22 +3,26 @@
         xmlns:xi="http://www.w3.org/2001/XInclude"
         version="5.0"
         xml:id="sec-meta-attributes">
+ <title>Meta Attributes</title>
 
-<title>Meta Attributes</title>
-
-<para>Like Nix packages, NixOS modules can declare meta-attributes to provide
-  extra information. Module meta attributes are defined in the
+ <para>
+  Like Nix packages, NixOS modules can declare meta-attributes to provide extra
+  information. Module meta attributes are defined in the
   <filename
     xlink:href="https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/misc/meta.nix">meta.nix</filename>
-  special module.</para>
+  special module.
+ </para>
 
-<para><literal>meta</literal> is a top level attribute like
+ <para>
+  <literal>meta</literal> is a top level attribute like
   <literal>options</literal> and <literal>config</literal>. Available
   meta-attributes are <literal>maintainers</literal> and
-  <literal>doc</literal>.</para>
+  <literal>doc</literal>.
+ </para>
 
-<para>Each of the meta-attributes must be defined at most once per module
-  file.</para>
+ <para>
+  Each of the meta-attributes must be defined at most once per module file.
+ </para>
 
 <programlisting>
 { config, lib, pkgs, ... }:
@@ -39,24 +43,21 @@
 }
 </programlisting>
 
-<calloutlist>
- <callout arearefs='modules-meta-1'>
-  <para>
+ <calloutlist>
+  <callout arearefs='modules-meta-1'>
+   <para>
     <varname>maintainers</varname> contains a list of the module maintainers.
-  </para>
- </callout>
-
- <callout arearefs='modules-meta-2'>
-  <para>
+   </para>
+  </callout>
+  <callout arearefs='modules-meta-2'>
+   <para>
     <varname>doc</varname> points to a valid DocBook file containing the module
-    documentation. Its contents is automatically added to <xref
-      linkend="ch-configuration"/>.
-    Changes to a module documentation have to be checked to not break
-    building the NixOS manual:
-  </para>
-  <programlisting>$ nix-build nixos/release.nix -A manual</programlisting>
- </callout>
-
-</calloutlist>
-
+    documentation. Its contents is automatically added to
+    <xref
+      linkend="ch-configuration"/>. Changes to a module documentation
+    have to be checked to not break building the NixOS manual:
+   </para>
+<programlisting>$ nix-build nixos/release.nix -A manual</programlisting>
+  </callout>
+ </calloutlist>
 </section>