Update tos_robin.h

Deleted unused parameter desc:
" * @param[in]   robin_state         state of the round robin."

kernel/core/include/tos_robin.h

@@ -37,20 +37,19 @@ __API__ void    tos_robin_timeslice_set(k_task_t *task, k_timeslice_t timeslice)
 
 /**
  * @brief Configure round robin.
- * Set the round robin state and the default time slice of the task.
+ * Set the default time slice of the task.
  *
  * @attention None
  *
- * @param[in]   robin_state         state of the round robin.
  * @param[in]   default_timeslice   default time slice of the task.
  *
  * @return  None
  */
 __API__ void    tos_robin_default_timeslice_config(k_timeslice_t default_timeslice);
 
-__KNL__ void robin_sched(k_prio_t prio);
+__KNL__ void    robin_sched(k_prio_t prio);
 
-#endif
+#endif /* TOS_CFG_ROUND_ROBIN_EN */
 
 __CDECLS_END