Improve RS documentation.

bug 8570568
Change-Id: I465fcc8ec3e2cc892dc3cb0067aacf5224338102
diff --git a/graphics/java/android/renderscript/Double2.java b/graphics/java/android/renderscript/Double2.java
index 9f4f328..29fd515 100644
--- a/graphics/java/android/renderscript/Double2.java
+++ b/graphics/java/android/renderscript/Double2.java
@@ -21,7 +21,7 @@
 
 
 /**
- * Class for exposing the native Renderscript double2 type back
+ * Class for exposing the native RenderScript double2 type back
  * to the Android system.
  *
  **/