Docs plus removing some junk per API review.

Change-Id: I45f995b656754550be68c78e467071d6e59b348f
diff --git a/graphics/java/android/renderscript/Mesh.java b/graphics/java/android/renderscript/Mesh.java
index f1f1237..fcf8178 100644
--- a/graphics/java/android/renderscript/Mesh.java
+++ b/graphics/java/android/renderscript/Mesh.java
@@ -172,7 +172,7 @@
 
         /**
         * Creates builder object
-        * @param rs
+        * @param rs Context to which the mesh will belong.
         * @param usage specifies how the mesh allocations are to be
         *              handled, whether they need to be uploaded to a
         *              buffer on the gpu, maintain a cpu copy, etc
@@ -512,7 +512,7 @@
         public static final int TEXTURE_0 = 0x0100;
 
         /**
-        * @param rs
+        * @param rs Context to which the mesh will belong.
         * @param vtxSize specifies whether the vertex is a float2 or
         *                float3
         * @param flags bitfield that is a combination of COLOR, NORMAL,