doxygen: qdm2: Drop documentation for non-existing function parameters

libavcodec/qdm2.c

@@ -1086,7 +1086,6 @@ static void process_subpacket_9 (QDM2Context *q, QDM2SubPNode *node)
  *
  * @param q         context
  * @param node      pointer to node with packet
- * @param length    packet length in bits
  */
 static void process_subpacket_10 (QDM2Context *q, QDM2SubPNode *node)
 {
@@ -1135,7 +1134,6 @@ static void process_subpacket_11 (QDM2Context *q, QDM2SubPNode *node)
  *
  * @param q         context
  * @param node      pointer to node with packet
- * @param length    packet length in bits
  */
 static void process_subpacket_12 (QDM2Context *q, QDM2SubPNode *node)
 {