doxygen: enable AUTOBRIEF, drop \brief

Especially for short descriptions, it is annoying to have to type \brief for
every single API doc.

Drop all \brief and enable the AUTOBRIEF feature of doxygen, which always takes
the first sentence of an API doc as the brief description.

Change-Id: I11a8a821b065a128108641a2a63fb5a2b1916e87
diff --git a/include/osmocom/gprs/gprs_bssgp.h b/include/osmocom/gprs/gprs_bssgp.h
index b70487c..0e9f7d6 100644
--- a/include/osmocom/gprs/gprs_bssgp.h
+++ b/include/osmocom/gprs/gprs_bssgp.h
@@ -58,7 +58,7 @@
 
 /* gprs_bssgp.c */
 
-/*! \brief BSSGP flow control (SGSN side) According to Section 8.2 */
+/*! BSSGP flow control (SGSN side) According to Section 8.2 */
 struct bssgp_flow_control {
 	uint32_t bucket_size_max;	/*!< maximum size of the bucket (octets) */
 	uint32_t bucket_leak_rate; 	/*!< leak rate of the bucket (octets/sec) */
@@ -158,13 +158,13 @@
 	return tlv_parse(tp, &tvlv_att_def, buf, len, 0, 0);
 }
 
-/*! \brief BSSGP Paging mode */
+/*! BSSGP Paging mode */
 enum bssgp_paging_mode {
 	BSSGP_PAGING_PS,
 	BSSGP_PAGING_CS,
 };
 
-/*! \brief BSSGP Paging scope */
+/*! BSSGP Paging scope */
 enum bssgp_paging_scope {
 	BSSGP_PAGING_BSS_AREA,		/*!< all cells in BSS */
 	BSSGP_PAGING_LOCATION_AREA,	/*!< all cells in LA */
@@ -172,7 +172,7 @@
 	BSSGP_PAGING_BVCI,		/*!< one cell */
 };
 
-/*! \brief BSSGP paging information */
+/*! BSSGP paging information */
 struct bssgp_paging_info {
 	enum bssgp_paging_mode mode;	/*!< CS or PS paging */
 	enum bssgp_paging_scope scope;	/*!< bssgp_paging_scope */