fix links

docs/modules/core/pages/effect/post-processor_water.adoc

@@ -14,7 +14,7 @@ image::effect/water-post.png[water-post.png,width="",height="",align="center",li
 
 [NOTE]
 ====
-The SeaMonkey WaterFilter is ideal for oceans and lakes, and especially for under-water scenes. If you only need a small simple water surface, such as a water trough or a shallow fountain, the <<jme3/advanced/water#,SimpleWaterProcessor>> may already be all you need.
+The SeaMonkey WaterFilter is ideal for oceans and lakes, and especially for under-water scenes. If you only need a small simple water surface, such as a water trough or a shallow fountain, the xref:effect/water.adoc[SimpleWaterProcessor] may already be all you need.
 ====
 
 
@@ -295,4 +295,4 @@ See also: <<jme3/advanced/audio#,audio>>.
 See also:
 
 *  link:{uri-forum}t/monkeys-at-the-beach/15000[JME3's Water Post-Process Effect] by Nehon
-*  <<jme3/advanced/water#,Simple water>>
+*  xref:effect/water.adoc[Simple water]

docs/modules/core/pages/effect/water.adoc

@@ -3,7 +3,7 @@
 :revdate: 2020/07/22
 
 
-jMonkeyEngine offers a SimpleWaterProcessor that turns any quad (flat rectangle) into a reflective water surface with waves. You can use this quad for simple limited water surfaces such as water troughs, shallow fountains, puddles, shallow water in channels. The SimpleWaterProcessor has less performance impact on your game than the full featured <<jme3/advanced/post-processor_water#,SeaMonkey WaterFilter>>; the main difference is that the SimpleWaterProcessor does not include under-water effects.
+jMonkeyEngine offers a SimpleWaterProcessor that turns any quad (flat rectangle) into a reflective water surface with waves. You can use this quad for simple limited water surfaces such as water troughs, shallow fountains, puddles, shallow water in channels. The SimpleWaterProcessor has less performance impact on your game than the full featured xref:effect/post-processor_water.adoc[SeaMonkey WaterFilter]; the main difference is that the SimpleWaterProcessor does not include under-water effects.
 
 Here is some background info for JME3's basic water implementation: