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/src/select.c b/src/select.c
index bdd53b2..575fd77 100644
--- a/src/select.c
+++ b/src/select.c
@@ -36,7 +36,7 @@
 
 /*! \addtogroup select
  *  @{
- *  \brief select() loop abstraction
+ *  select() loop abstraction
  */
 
 /*! \file select.c */
@@ -46,7 +46,7 @@
 static int unregistered_count;
 
 
-/*! \brief Check if a file descriptor is already registered
+/*! Check if a file descriptor is already registered
  *  \param[in] fd osmocom file descriptor to be checked
  *  \returns true if registered; otherwise false
  */
@@ -62,7 +62,7 @@
 	return false;
 }
 
-/*! \brief Register a new file descriptor with select loop abstraction
+/*! Register a new file descriptor with select loop abstraction
  *  \param[in] fd osmocom file descriptor to be registered
  *  \returns 0 on success; negative in case of error
  */
@@ -104,7 +104,7 @@
 	return 0;
 }
 
-/*! \brief Unregister a file descriptor from select loop abstraction
+/*! Unregister a file descriptor from select loop abstraction
  *  \param[in] fd osmocom file descriptor to be unregistered
  */
 void osmo_fd_unregister(struct osmo_fd *fd)
@@ -116,7 +116,7 @@
 	llist_del(&fd->list);
 }
 
-/*! \brief Populate the fd_sets and return the highest fd number
+/*! Populate the fd_sets and return the highest fd number
  *  \param[in] _rset The readfds to populate
  *  \param[in] _wset The wrtiefds to populate
  *  \param[in] _eset The errorfds to populate
@@ -187,7 +187,7 @@
 	return work;
 }
 
-/*! \brief select main loop integration
+/*! select main loop integration
  *  \param[in] polling should we pollonly (1) or block on select (0)
  *  \returns 0 if no fd handled; 1 if fd handled; negative in case of error
  */
@@ -217,7 +217,7 @@
 	return osmo_fd_disp_fds(&readset, &writeset, &exceptset);
 }
 
-/*! \brief find an osmo_fd based on the integer fd
+/*! find an osmo_fd based on the integer fd
  *  \param[in] fd file descriptor to use as search key
  *  \returns \ref osmo_fd for \ref fd; NULL in case it doesn't exist */
 struct osmo_fd *osmo_fd_get_by_fd(int fd)