[totem/mallard-documentation] Update how to change the volume

[Andre Klapper <aklapper src gnome org>]

commit 86ec2f43e504008c445ffaede0bc64a1bee5bbda
Author: Andre Klapper <a9016009 gmx de>
Date:   Thu Jan 10 00:15:12 2019 +0100

    Update how to change the volume

 help/C/figures/volume-button-slider.png | Bin 0 -> 5405 bytes
 help/C/sound-volume.page                |  30 +++++++++++++++++-------------
 2 files changed, 17 insertions(+), 13 deletions(-)
---
diff --git a/help/C/figures/volume-button-slider.png b/help/C/figures/volume-button-slider.png
new file mode 100644
index 00000000..d5b6884a
Binary files /dev/null and b/help/C/figures/volume-button-slider.png differ
diff --git a/help/C/sound-volume.page b/help/C/sound-volume.page
index c3b0fa80..0bdc3f7e 100644
--- a/help/C/sound-volume.page
+++ b/help/C/sound-volume.page
@@ -4,6 +4,7 @@
 
   <info>
     <link type="guide" xref="index#playing-media"/>
+    <revision pkgversion="3.30.0" version="0.1" date="2019-01-09" status="draft"/>
 
     <credit type="author">
       <name>Marta Bogdanowicz</name>
@@ -13,35 +14,38 @@
       <name>Ekaterina Gerasimova</name>
       <email>kittykat3756 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>
 
-    <desc>Increase or decrease the volume of a movie or music.</desc>
+    <desc>Increase or decrease the volume of a movie.</desc>
   </info>
 
   <title>Adjust volume</title>
 
-  <p>You can adjust the volume in a number of different ways:</p>
+  <p>You can adjust the volume in the bottom right corner:</p>
 
   <list>
-    <item>
-      <p>Select <guiseq><gui style="menu">Sound</gui>
-      <gui style="menuitem">Volume Up</gui></guiseq> to make the sound
-      louder.</p>
-    </item>
-    <item>
-      <p>Select <guiseq><gui style="menu">Sound</gui>
-      <gui style="menuitem">Volume Down</gui></guiseq> to make the sound
-      quieter.</p>
-    </item>
     <item>
       <p>Press the <gui>Volume button</gui> which is below the video area and
       drag the slider to change volume.</p>
     </item>
+    <item>
+      <p>You can also use the <key>Up</key> key to increase the volume and the
+    <key>Down</key> key to decrease the volume.</p>
+    </item>
   </list>
 
-  <p>You can only change the volume while a file is playing.</p>
+  <figure>
+    <title>Volume button and slider</title>
+    <media type="image" mime="image/png" src="figures/volume-button-slider.png">
+    <p>Screenshot of the volume button and slider.</p>
+    </media>
+  </figure>
 
 </page>