Improve RS documentation.

bug 8570568
Change-Id: I465fcc8ec3e2cc892dc3cb0067aacf5224338102
diff --git a/graphics/java/android/renderscript/Matrix4f.java b/graphics/java/android/renderscript/Matrix4f.java
index 4600424..cd18e30 100644
--- a/graphics/java/android/renderscript/Matrix4f.java
+++ b/graphics/java/android/renderscript/Matrix4f.java
@@ -21,7 +21,7 @@
 
 
 /**
- * Class for exposing the native Renderscript rs_matrix4x4 type back to the Android system.
+ * Class for exposing the native RenderScript rs_matrix4x4 type back to the Android system.
  *
  **/
 public class Matrix4f {