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/core/utils.h b/include/osmocom/core/utils.h
index 1d1ebd8..ce49cbe 100644
--- a/include/osmocom/core/utils.h
+++ b/include/osmocom/core/utils.h
@@ -9,26 +9,26 @@
 
 /*! \file utils.h */
 
-/*! \brief Determine number of elements in an array of static size */
+/*! Determine number of elements in an array of static size */
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
-/*! \brief Return the maximum of two specified values */
+/*! Return the maximum of two specified values */
 #define OSMO_MAX(a, b) ((a) >= (b) ? (a) : (b))
-/*! \brief Return the minimum of two specified values */
+/*! Return the minimum of two specified values */
 #define OSMO_MIN(a, b) ((a) >= (b) ? (b) : (a))
-/*! \brief Stringify the contents of a macro, e.g. a port number */
+/*! Stringify the contents of a macro, e.g. a port number */
 #define OSMO_STRINGIFY(x) #x
-/*! \brief Make a value_string entry from an enum value name */
+/*! Make a value_string entry from an enum value name */
 #define OSMO_VALUE_STRING(x) { x, #x }
-/*! \brief Number of bytes necessary to store given BITS */
+/*! Number of bytes necessary to store given BITS */
 #define OSMO_BYTES_FOR_BITS(BITS) ((BITS + 8 - 1) / 8)
 
 #include <stdint.h>
 #include <stdio.h>
 
-/*! \brief A mapping between human-readable string and numeric value */
+/*! A mapping between human-readable string and numeric value */
 struct value_string {
-	unsigned int value;	/*!< \brief numeric value */
-	const char *str;	/*!< \brief human-readable string */
+	unsigned int value;	/*!< numeric value */
+	const char *str;	/*!< human-readable string */
 };
 
 const char *get_value_string(const struct value_string *vs, uint32_t val);