[totem/mallard-documentation] Fix broken markup

[Andre Klapper <aklapper src gnome org>]

commit a0ba03f082c8ab78c193601e70bc05831b793cd1
Author: Andre Klapper <a9016009 gmx de>
Date:   Fri Jan 11 17:59:32 2019 +0100

    Fix broken markup

 help/C/preferences.page | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/help/C/preferences.page b/help/C/preferences.page
index 8fa50560..aa7200d5 100644
--- a/help/C/preferences.page
+++ b/help/C/preferences.page
@@ -65,7 +65,7 @@
           <title><code>Video</code></title>
           <p><app>Videos</app> allows you to specify, whether you want to
             <gui>Disable deinterlacing of interlaced videos</gui>.
-          <p>Tick the desired option.</p>
+            Do it by ticking this option.</p>
         </item>
         <item>
           <title><code>Color Balance</code></title>