Improve the documentation of the RenderScript API.

Only the explanations should be changing.

Change-Id: I889b366e3be44f5ac7f44a199e4b9a47353665e2
diff --git a/scriptc/rs_matrix.rsh b/scriptc/rs_matrix.rsh
index 169d2b2..bb7c6e8 100644
--- a/scriptc/rs_matrix.rsh
+++ b/scriptc/rs_matrix.rsh
@@ -17,7 +17,7 @@
 // Don't edit this file!  It is auto-generated by frameworks/rs/api/generate.sh.
 
 /*
- * rs_matrix.rsh: Matrix functions
+ * rs_matrix.rsh: Matrix Functions
  *
  * These functions let you manipulate square matrices of rank 2x2, 3x3, and 4x4.
  * They are particularly useful for graphical transformations and are
@@ -51,6 +51,8 @@
 #include "rs_vector_math.rsh"
 
 /*
+ * rsExtractFrustumPlanes: Compute frustum planes
+ *
  * Computes 6 frustum planes from the view projection matrix
  *
  * Parameters:
@@ -111,7 +113,9 @@
 }
 
 /*
- * Checks if a sphere is withing the 6 frustum planes
+ * rsIsSphereInFrustum: Checks if a sphere is within the frustum planes
+ *
+ * Returns true if the sphere is within the 6 frustum planes.
  *
  * Parameters:
  *   sphere: float4 representing the sphere