Update post-processor_water.adoc

Modified urls to use attributes.

src/docs/asciidoc/jme3/advanced/post-processor_water.adoc

@@ -4,6 +4,8 @@
 :revdate: 2016/03/17 20:48
 :relfileprefix: ../../
 :imagesdir: ../..
+:uri-jmonkeyengine: https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/
+:uri-forum: https://hub.jmonkeyengine.org/
 ifdef::env-github,env-browser[:outfilesuffix: .adoc]
 
 
@@ -44,9 +46,9 @@ Now we have the rendered scene in a texture, and we can reconstruct the position
 
 These are test cases in the jME3 repository:
 
-*  link:https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/jme3-examples/src/main/java/jme3test/water/TestPostWater.java[jme3/src/test/jme3test/water/TestPostWater.java] (ocean island)
-*  link:https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/jme3-examples/src/main/java/jme3test/water/TestPostWaterLake.java[jme3/src/test/jme3test/water/TestPostWaterLake.java] (calm and muddy water pond)
-*  link:https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/jme3-examples/src/main/java/jme3test/water/TestMultiPostWater.java[jme3/src/test/jme3test/water/TestMultiPostWater.java] (several ponds of different sizes at different heights etc)
+*  link:{uri-jmonkeyengine}jme3-examples/src/main/java/jme3test/water/TestPostWater.java[TestPostWater.java] (ocean island)
+*  link:{uri-jmonkeyengine}jme3-examples/src/main/java/jme3test/water/TestPostWaterLake.java[TestPostWaterLake.java] (calm and muddy water pond)
+*  link:{uri-jmonkeyengine}jme3-examples/src/main/java/jme3test/water/TestMultiPostWater.java[TestMultiPostWater.java] (several ponds of different sizes at different heights etc)
 
 
 === Using the Water Filter
@@ -295,5 +297,5 @@ See also: <<jme3/advanced/audio#,audio>>.
 
 See also:
 
-*  link:https://hub.jmonkeyengine.org/t/monkeys-at-the-beach/15000[JME3's Water Post-Process Effect] by Nehon
+*  link:{uri-forum}t/monkeys-at-the-beach/15000[JME3's Water Post-Process Effect] by Nehon
 *  <<jme3/advanced/water#,Simple water>>