Fix broken link

src/docs/asciidoc/jme3/beginner/hello_material.adoc

@@ -230,7 +230,8 @@ Let's have a look at the part of the code example where you create the shiny bum
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 ..  Set a standard rocky texture in the `DiffuseMap` layer. +
-image::http://jmonkeyengine.googlecode.com/svn/trunk/engine/test-data/Textures/Terrain/Pond/Pond.jpg[Pond.jpg,with="64",height="64",align="right"]
+
+image::https://github.com/jMonkeyEngine/jmonkeyengine/raw/445f7ed010199d30c484fe75bacef4b87f2eb38e/jme3-testdata/src/main/resources/Textures/Terrain/Pond/Pond.jpg[Pond.jpg,with="64",height="64",align="right"]
 
 [source,java]
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@@ -241,7 +242,8 @@ image::http://jmonkeyengine.googlecode.com/svn/trunk/engine/test-data/Textures/T
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 ..  Set the `NormalMap` layer that contains the bumpiness. The NormalMap was generated for this particular DiffuseMap with a special tool (e.g. Blender). 
-image::http://jmonkeyengine.googlecode.com/svn/trunk/engine/test-data/Textures/Terrain/Pond/Pond_normal.png[Pond_normal.png,with="64",height="64",align="right"]
+
+image::https://github.com/jMonkeyEngine/jmonkeyengine/raw/445f7ed010199d30c484fe75bacef4b87f2eb38e/jme3-testdata/src/main/resources/Textures/Terrain/Pond/Pond_normal.png[Pond_normal.png,with="64",height="64",align="right"]
  
 [source,java]
 ----