Sound namespace changes: Add missing documentation and a lost sound.

docs/sdk/definition/index.xml

@@ -72,6 +72,7 @@
       <dt id="wav"><img height="16" src="../../images/icon_sound.png" width="16"/>*.wav/*.ogg</dt>
       <dd>
         <text>Object local sounds. As these are always loaded and not dynamically unloaded as are scenario sounds you should use these sparingly and with small sound files only.</text>
+        <text>Object local sounds within valid definitions are automatically put into a namespace with the ID of the object. They can be played using <funclink>Sound</funclink>("id::soundname").</text>
       </dd>
     </dl>
 	<h id="CrewMembers">Additional files for crew members</h>

docs/sdk/files.xml

@@ -28,6 +28,7 @@
       <text>Graphics, sound, and music of the original game are grouped in these folders and should not be modified.</text>
       <text>Using the menu system, group files can be edited and/or converted to normal directories. Group file components can then be edited using common applications for text or graphics editing. Menu system and game engine can both load packed group files or unpacked directories directly.</text>
       <text>Unpacking group files greatly increases speed while editing large or deeply nested groups.</text>
+      <text>The global file Sound.ocg may contain any subfolders with .ocg extension to define sound namespaces. For example, a file Sound.ocg/Animals.ocg/Growl.ogg can be played back using <funclink>Sound</funclink>("Animals::Growl").</text>
     </dd>
   </dl>
   <author>Sven2</author><date>2002-04</date>

docs/sdk/scenario/index.xml

@@ -81,6 +81,7 @@ US:Attack of the Killer Wipfs</code>
       <dt id="Soundocg"><img height="16" src="../../images/icon_system.png" width="16"/>Sound.ocg</dt>
       <dd>
 		<text>Scenarios can contain any number of sound files (*.ogg or *.wav). These can be played back by script during the game. Scenario local sounds are loaded dynamically on demand which might cause delays with large scenario files. The sounds should be stored in a local sound group.</text>
+		<text>Just like the global sound file, scenario local Sound.ocg groups may contain any subfolders with .ocg extension to define sound namespaces. For example, a file Sound.ocg/Animals.ocg/Growl.ogg can be played back using <funclink>Sound</funclink>("Animals::Growl").</text>
       </dd>
       <dt id="Musicocg"><img height="16" src="../../images/icon_system.png" width="16"/>Music.ocg</dt>
       <dd>