- Updated Doxygen documentation generation and documentation on small parts

diff --git a/include/polarssl/sha2.h b/include/polarssl/sha2.h
index 813a96c..5e2d907 100644
--- a/include/polarssl/sha2.h
+++ b/include/polarssl/sha2.h
@@ -1,7 +1,7 @@
 /**
  * \file sha2.h
  *
- * \brief SHA-256 cryptographic hash function
+ * \brief SHA-224 and SHA-256 cryptographic hash function
  *
  *  Copyright (C) 2006-2010, Brainspark B.V.
  *