Fixed some broken links.

src/docs/asciidoc/jme3/advanced/monkey_zone.adoc

@@ -10,10 +10,10 @@ ifdef::env-github,env-browser[:outfilesuffix: .adoc]
 
 MonkeyZone is an multi-player demo game provided by the jME core developer team.
 
-*  link:http://monkeyzone.googlecode.com/svn/trunk/[Download source code] (Subversion Repository)
+*  link:https://github.com/jMonkeyEngine/monkeyzone[Download source code] (Github Repository)
 *  link:http://www.youtube.com/watch?v=98yITEoJvqE[Watch pre-alpha video footage] (YouTube Video)
-*  link:http://jmonkeyengine.org/2011/02/13/monkeyzone-a-jme3-game-from-the-core/[Read "MonkeyZone – a jME3 game from the core"] (news article)
-*  link:http://jmonkeyengine.org/groups/user-code-projects/forum/topic/open-game-finder/[Related forum thread: Open Game Finder]
+*  link:http://web.archive.org/web/20121021075434/http://jmonkeyengine.org/2011/02/13/monkeyzone-a-jme3-game-from-the-core/[Read "MonkeyZone – a jME3 game from the core"] (news article)
+*  link:https://hub.jmonkeyengine.org/t/open-game-finder/13399/11[Related forum thread: Open Game Finder]
 
 This open-source demo: