Make sure that labeling is used consistently in all function headers.

fs/mqueue/mq_close.c

@@ -67,7 +67,7 @@
  *   mqdes - Message queue descriptor.
  *   group - Group that has the open descriptor.
  *
- * Return Value:
+ * Returned Value:
  *   Zero (OK) if the message queue is closed successfully.  Otherwise, a
  *   negated errno value is returned.
  *
@@ -125,7 +125,7 @@ int nxmq_close_group(mqd_t mqdes, FAR struct task_group_s *group)
  * Parameters:
  *   mqdes - Message queue descriptor.
  *
- * Return Value:
+ * Returned Value:
  *   0 (OK) if the message queue is closed successfully,
  *   otherwise, -1 (ERROR).
  *
@@ -176,7 +176,7 @@ int mq_close(mqd_t mqdes)
  * Parameters:
  *   inode - The message queue inode
  *
- * Return Value:
+ * Returned Value:
  *   None
  *
  ****************************************************************************/

fs/mqueue/mq_open.c

@@ -79,7 +79,7 @@
  *        created to determine the maximum number of
  *        messages that may be placed in the message queue.
  *
- * Return Value:
+ * Returned Value:
  *   A message queue descriptor or (mqd_t)-1 (ERROR)
  *
  * Assumptions:

fs/mqueue/mq_unlink.c

@@ -66,7 +66,7 @@
  * Parameters:
  *   mq_name - Name of the message queue
  *
- * Return Value:
+ * Returned Value:
  *   None
  *
  * Assumptions:

fs/mqueue/mqueue.h

@@ -80,7 +80,7 @@ extern "C"
  * Parameters:
  *   inode - The message queue inode
  *
- * Return Value:
+ * Returned Value:
  *   None
  *
  ****************************************************************************/