[totem/mallard-documentation: 2476/2501] Don't abuse <code> for non-code text

[Jeremy Bicha <jbicha src gnome org>]

commit ad106b7501b2b446e6334ec57094fe654baf760c
Author: Andre Klapper <a9016009 gmx de>
Date:   Fri Jan 11 23:09:43 2019 +0100

    Don't abuse <code> for non-code text

 help/C/preferences.page | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)
---
diff --git a/help/C/preferences.page b/help/C/preferences.page
index 8ffb0347..ed6bf3ec 100644
--- a/help/C/preferences.page
+++ b/help/C/preferences.page
@@ -33,7 +33,7 @@
     <title>General</title>
       <terms>
         <item>
-          <title><code>External Subtitles</code></title>
+          <title><gui>External Subtitles</gui></title>
             <list>
               <item>
                 <p>Tick the option
@@ -51,12 +51,12 @@
             </list>
         </item>
         <item>
-          <title><code>External Chapters</code></title>
+          <title><gui>External Chapters</gui></title>
           <p><app>Videos</app> allows you to load chapter files when the movie is
           loaded. Do it by ticking this option.</p>
         </item>
         <item>
-          <title><code>Plugins</code></title>
+          <title><gui>Plugins</gui></title>
           <p>Plugins offer extra featured and extend functionality. You can view
           the list of plugins by pressing <gui style="button">Plugins…</gui>.
           Select the the wanted one and press
@@ -69,13 +69,13 @@
     <title>Display</title>
       <terms>
         <item>
-          <title><code>Video</code></title>
+          <title><gui>Video</gui></title>
           <p><app>Videos</app> allows you to specify, whether you want to
             <gui>Disable deinterlacing of interlaced videos</gui>.
             Do it by ticking this option.</p>
         </item>
         <item>
-          <title><code>Color Balance</code></title>
+          <title><gui>Color Balance</gui></title>
           <p>This option allows you to adjust <gui>Brightness</gui>,
           <gui>Contrast</gui>, <gui>Saturation</gui> or <gui>Hue</gui> of
           viewed videos. Do it by clicking and dragging along sliders.</p>
@@ -91,7 +91,7 @@
     <title>Audio</title>
       <terms>
         <item>
-          <title><code>Audio Output</code></title>
+          <title><gui>Audio Output</gui></title>
           <p>Choose the type of <gui>Audio Output</gui> from the drop-down list.
           </p>
         </item>