Fixed broken links.

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

@@ -64,13 +64,13 @@ Nifty GUIs are made up of the following *elements*:
 **  link:https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/jme3-testdata/src/main/resources/Interface/Nifty/HelloJme.xml[HelloJme.xml] - Can be found in <<sdk/sample_code#jme3testdata-assets#,jme-testdata/Interface/Nifty>> also.
 
 *  Java examples
-**  link:http://code.google.com/p/jmonkeyengine/source/browse/trunk/engine/src/test/jme3test/niftygui/TestNiftyGui.java[TestNiftyGui.java]
-**  link:http://code.google.com/p/jmonkeyengine/source/browse/trunk/engine/src/test/jme3test/niftygui/TestNiftyToMesh.java[TestNiftyToMesh.java]
+**  link:https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/jme3-examples/src/main/java/jme3test/niftygui/TestNiftyGui.java[TestNiftyGui.java] - Can be found in <<sdk/sample_code#the-jme3tests-project-template#,jme3 tests>> also.
+**  link:https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/jme3-examples/src/main/java/jme3test/niftygui/TestNiftyToMesh.java[TestNiftyToMesh.java] - Can be found in <<sdk/sample_code#the-jme3tests-project-template#,jme3 tests>> also.
 
 *  jME3-ready version of the Nifty +++<abbr title="Graphical User Interface">GUI</abbr>+++ 1.3 demo (sample code, Java)
 **  link:http://files.seapegasus.org/NiftyGuiDemo.zip[NiftyGuiDemo.zip]
 
-*  Find more sample code in the link:http://nifty-gui.svn.sourceforge.net/viewvc/nifty-gui/nifty-default-controls-examples/trunk/[Nifty GUI source repository]
+*  Find more sample code in the link:https://github.com/nifty-gui/nifty-gui/tree/nifty-main-1.4.2/nifty-examples/src/main/java/de/lessvoid/nifty/examples[Nifty GUI source repository]
 
 
 === External Documentation