include: event_scheduler: use retval to list specific return values

Use @RetVal instead of @return when listing specific return values.

Signed-off-by: Andreas Moltumyr <[email protected]>

Author: anhmolt

include/event_scheduler.h

@@ -58,10 +58,10 @@ struct event_scheduler_event {
  * @param data Event data.
  * @param len Event data length.
  *
- * @return 0 On success.
- * @return -EFAULT @p handler is @c NULL.
- * @return -EINVAL Invalid @p data and @p len combination.
- * @return -ENOMEM No memory to schedule this event.
+ * @retval 0 On success.
+ * @retval -EFAULT @p handler is @c NULL.
+ * @retval -EINVAL Invalid @p data and @p len combination.
+ * @retval -ENOMEM No memory to schedule this event.
  */
 int event_scheduler_defer(evt_handler_t handler, void *data, size_t len);
 
@@ -70,7 +70,7 @@ int event_scheduler_defer(evt_handler_t handler, void *data, size_t len);
  *
  * Process deferred events in the main thread.
  *
- * @return 0 On success.
+ * @retval 0 On success.
  */
 int event_scheduler_process(void);