Updated doxygen documentations

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@2037 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjmedia/include/pjmedia-codec/l16.h b/pjmedia/include/pjmedia-codec/l16.h
index c12320b..03ecb5e 100644
--- a/pjmedia/include/pjmedia-codec/l16.h
+++ b/pjmedia/include/pjmedia-codec/l16.h
@@ -25,8 +25,9 @@
 /**
  * @defgroup PJMED_L16 L16 Codec Family
  * @ingroup PJMEDIA_CODEC
- * @brief 16bit linear codecs (useful for debugging)
+ * @brief PCM/16bit/linear codecs
  * @{
+ *
  * This section describes functions to register and register L16 codec
  * factory to the codec manager. After the codec factory has been registered,
  * application can use @ref PJMEDIA_CODEC API to manipulate the codec.