doc: Fix the Doxygen section endings

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/src/gsm/tlv_parser.c b/src/gsm/tlv_parser.c
index c832d56..0ac9092 100644
--- a/src/gsm/tlv_parser.c
+++ b/src/gsm/tlv_parser.c
@@ -186,4 +186,4 @@
 		tvlv_att_def.def[i].type = TLV_TYPE_TvLV;
 }
 
-/*! }@ */
+/*! @} */