Improve RS documentation.

bug 8570568
Change-Id: I465fcc8ec3e2cc892dc3cb0067aacf5224338102
diff --git a/graphics/java/android/renderscript/ScriptIntrinsic3DLUT.java b/graphics/java/android/renderscript/ScriptIntrinsic3DLUT.java
index 86f37d8..34540a1 100644
--- a/graphics/java/android/renderscript/ScriptIntrinsic3DLUT.java
+++ b/graphics/java/android/renderscript/ScriptIntrinsic3DLUT.java
@@ -40,7 +40,7 @@
      *
      * The defaults tables are identity.
      *
-     * @param rs The Renderscript context
+     * @param rs The RenderScript context
      * @param e Element type for intputs and outputs
      *
      * @return ScriptIntrinsic3DLUT
@@ -55,6 +55,13 @@
         return new ScriptIntrinsic3DLUT(id, rs, e);
     }
 
+    /**
+     * Sets the {@link android.renderscript.Allocation} to be used as the lookup table.
+     *
+     * The lookup table must use the same {@link android.renderscript.Element} as the intrinsic.
+     *
+     */
+
     public void setLUT(Allocation lut) {
         final Type t = lut.getType();