soc: ti: knav_qmss: Fix kernel-doc Return: tags

soc: ti: knav_qmss: Fix kernel-doc Return: tags

Fix functions that use inline 'Returns ...' instead of 'Return:'
kernel-doc comments, producing warnings with W=2:

  knav_qmss_queue.c:524: No description found for return value
  of 'knav_queue_open'

Tested-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Sai Sree Kartheek Adivi <s-adivi@ti.com>
Reviewed-by: Hari Prasath Gujulan Elango <gehariprasath@ti.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://patch.msgid.link/20260512170623.3174416-5-nm@ti.com
Signed-off-by: Nishanth Menon <nm@ti.com>