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/gsm.h b/pjmedia/include/pjmedia-codec/gsm.h
index 4045c44..7c7759f 100644
--- a/pjmedia/include/pjmedia-codec/gsm.h
+++ b/pjmedia/include/pjmedia-codec/gsm.h
@@ -31,6 +31,7 @@
  * @ingroup PJMEDIA_CODEC
  * @brief Implementation of GSM FR based on GSM 06.10 library
  * @{
+ *
  * This section describes functions to register and register GSM codec
  * factory to the codec manager. After the codec factory has been registered,
  * application can use @ref PJMEDIA_CODEC API to manipulate the codec.