Docs plus removing some junk per API review.

Change-Id: I45f995b656754550be68c78e467071d6e59b348f
diff --git a/graphics/java/android/renderscript/ProgramFragmentFixedFunction.java b/graphics/java/android/renderscript/ProgramFragmentFixedFunction.java
index 663bc9f..1af31f8 100644
--- a/graphics/java/android/renderscript/ProgramFragmentFixedFunction.java
+++ b/graphics/java/android/renderscript/ProgramFragmentFixedFunction.java
@@ -194,7 +194,7 @@
         /**
          * Creates a builder for fixed function fragment program
          *
-         * @param rs
+         * @param rs Context to which the program will belong.
          */
         public Builder(RenderScript rs) {
             mRS = rs;