nixos docs: give IDs to things

nixos/modules/services/editors/emacs.xml

@@ -39,7 +39,7 @@
     starting the Emacs daemon.
   </para>
 
-  <section>
+  <section xml:id="module-services-emacs-installing">
     <title>Installing <application>Emacs</application></title>
 
     <para>
@@ -49,7 +49,7 @@
       can be enabled.
     </para>
 
-    <section>
+    <section xml:id="module-services-emacs-releases">
       <title>The Different Releases of Emacs</title>
 
       <para>
@@ -100,7 +100,7 @@
       </para>
 
     </section>
-    <section>
+    <section xml:id="module-services-emacs-adding-packages">
       <title>Adding Packages to Emacs</title>
       <para>
         Emacs includes an entire ecosystem of functionality beyond
@@ -339,7 +339,7 @@ https://nixos.org/nixpkgs/manual/#sec-modify-via-packageOverrides
       </para>
     </section>
 
-    <section>
+    <section xml:id="module-services-emacs-advanced">
       <title>Advanced Emacs Configuration</title>
 
       <para>
@@ -380,7 +380,7 @@ in [...]
     </section>
   </section>
 
-<section>
+<section xml:id="module-services-emacs-running">
   <title>Running Emacs as a Service</title>
   <para>
     <productname>NixOS</productname> provides an optional
@@ -396,7 +396,7 @@ in [...]
     <filename>modules/services/editors/emacs.nix</filename>
   </para>
 
-  <section>
+  <section xml:id="module-services-emacs-enabling">
     <title>Enabling the Service</title>
 
     <para>
@@ -438,7 +438,7 @@ $ systemctl --user start emacs.service  # to start the Emacs daemon
 
   </section>
 
-  <section>
+  <section xml:id="module-services-emacs-starting-client">
     <title>Starting the client</title>
     <para>
       Ensure that the emacs server is enabled, either by customizing
@@ -457,7 +457,7 @@ emacsclient --create-frame --tty  # opens a new frame on the current terminal
     </para>
   </section>
 
-  <section>
+  <section xml:id="module-services-emacs-editor-variable">
     <title>Configuring the <varname>EDITOR</varname> variable</title>
     <!--<title><command>emacsclient</command> as the Default Editor</title>-->
 
@@ -487,7 +487,7 @@ emacsclient --create-frame --tty  # opens a new frame on the current terminal
     </para>
   </section>
 
-  <section>
+  <section xml:id="module-services-emacs-per-user">
     <title>Per-User Enabling of the Service</title>
 
     <para>
@@ -515,7 +515,7 @@ emacsclient --create-frame --tty  # opens a new frame on the current terminal
   </section>
 </section>
 
-<section>
+<section xml:id="module-services-emacs-configuring">
   <title>Configuring Emacs</title>
 
   <para>
@@ -548,7 +548,7 @@ emacsclient --create-frame --tty  # opens a new frame on the current terminal
       server-switch-hook, server-done-hook?
   -->
 
-  <section>
+  <section xml:id="module-services-emacs-major-mode">
     <title>A Major Mode for Nix Expressions</title>
 
     <para>
@@ -558,7 +558,7 @@ emacsclient --create-frame --tty  # opens a new frame on the current terminal
     </para>
   </section>
 
-  <section>
+  <section xml:id="module-services-emacs-man-pages">
     <title>Accessing man pages</title>
     <para>
       You can use <function>woman</function> to get completion of all