- Updated Doxygen documentation generation and documentation on small parts

diff --git a/include/polarssl/des.h b/include/polarssl/des.h
index 0542329..0d3493c 100644
--- a/include/polarssl/des.h
+++ b/include/polarssl/des.h
@@ -1,7 +1,7 @@
 /**
  * \file des.h
  *
- * \brief Debug functions
+ * \brief DES block cipher
  *
  *  Copyright (C) 2006-2010, Brainspark B.V.
  *