doxygen: score: adjust doc in corebarrier.h to doxygen guidelines

Update #3706.

cpukit/include/rtems/score/corebarrier.h

@@ -1,6 +1,8 @@
 /**
  * @file
  *
+ * @ingroup RTEMSScoreBarrier
+ *
  * @brief Constants and Structures Associated with the Barrier Handler
  *
  * This include file contains all the constants and structures associated
@@ -30,10 +32,13 @@ extern "C" {
  *
  * @ingroup RTEMSScore
  *
+ * @brief Functionality for Foundation Barrier Services
+ *
  * This handler encapsulates functionality which provides the foundation
  * Barrier services used in all of the APIs supported by RTEMS.
+ *
+ * @{
  */
-/**@{*/
 
 /**
  *  Flavors of barriers.
@@ -81,7 +86,7 @@ typedef struct {
   uint32_t                 number_of_waiting_threads;
 }   CORE_barrier_Control;
 
-/**@}*/
+/** @} */
 
 #ifdef __cplusplus
 }