clean up and add javadocs

Change-Id: I7f628106247de887cd91c4a4b4b55d3ebfa700c8
diff --git a/graphics/java/android/renderscript/Sampler.java b/graphics/java/android/renderscript/Sampler.java
index c656d75..8ee4d72 100644
--- a/graphics/java/android/renderscript/Sampler.java
+++ b/graphics/java/android/renderscript/Sampler.java
@@ -29,8 +29,8 @@
 import android.graphics.BitmapFactory;
 
 /**
- * Sampler object which defines how data is extracted from textures.  Samplers
- * are attached to Program objects (currently only fragment) when those objects
+ * Sampler object which defines how data is extracted from textures. Samplers
+ * are attached to Program objects (currently only ProgramFragment) when those objects
  * need to access texture data.
  **/
 public class Sampler extends BaseObj {