[totem/mallard-documentation] Remove plugin names as they are distro specific; move to Troubleshooting

[Andre Klapper <aklapper src gnome org>]

commit e9c4789e5cc912975c46593dd4ba7f8c86bbfb53
Author: Andre Klapper <a9016009 gmx de>
Date:   Wed Jan 9 23:33:22 2019 +0100

    Remove plugin names as they are distro specific; move to Troubleshooting

 help/C/supported-formats.page | 30 ++++++++----------------------
 1 file changed, 8 insertions(+), 22 deletions(-)
---
diff --git a/help/C/supported-formats.page b/help/C/supported-formats.page
index 6ecd589e..ece57aba 100644
--- a/help/C/supported-formats.page
+++ b/help/C/supported-formats.page
@@ -3,39 +3,25 @@
       id="supported-formats">
 
   <info>
-    <link type="guide" xref="index"/>
-    <link type="seealso" xref="introduction"/>
+    <link type="guide" xref="index#troubleshooting"/>
     <desc>See what file formats are supported.</desc>
     <credit type="author">
       <name>Marta Bogdanowicz</name>
       <email>majus85 gmail com</email>
     </credit>
+    <credit type="author">
+      <name>Andre Klapper</name>
+      <email>ak-47 gmx net</email>
+    </credit>
     <license>
       <p>Creative Commons Share Alike 3.0</p>
     </license>
   </info>
 
-  <title>Supported file formats</title>
+  <title>Cannot play a certain file format</title>
 
   <p>File formats displayed by <app>Videos</app> depend on <gui>GStreamer</gui>
-  plugins. Install plugin packages you need:</p>
-
-  <list>
-    <item>
-      <p>The basic and essential plugin for GStreamer is
-      <code>gst-plugins-base</code>.</p>
-    </item>
-    <item>
-      <p>The plugin for most open formts is <code>gst-plugins-good</code>.</p>
-    </item>
-    <item>
-      <p>The plugins needed to play DVDs are <code>gst-plugins-ugly</code> and
-      <code>gst-plugins-bad</code>.</p>
-    </item>
-    <item>
-      <p>The plugin, which contains all the basic decoders for popular codecs is
-      <code>gst-ffmpeg</code>.</p>
-    </item>
-  </list>
+  plugins. If certain file formats are not supported, please refer to a support
+  forum of your distribution to find out which package to install.</p>
 
 </page>