RDMA/siw: Update comments for siw_qp_sq_process

There is no siw_sq_work_handler in code, change it with siw_tx_thread
since siw_run_sq -> siw_sq_resume -> siw_qp_sq_process.
Acked-by: Bernard Metzler <bmt@zurich.ibm.com>
Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Link: https://lore.kernel.org/r/20231113115726.12762-18-guoqing.jiang@linux.devSigned-off-by: Leon Romanovsky <leon@kernel.org>

drivers/infiniband/sw/siw/siw_qp_tx.c

@@ -997,13 +997,12 @@ static int siw_qp_sq_proc_local(struct siw_qp *qp, struct siw_wqe *wqe)
  * MPA FPDUs, each containing a DDP segment.
  *
  * SQ processing may occur in user context as a result of posting
- * new WQE's or from siw_sq_work_handler() context. Processing in
+ * new WQE's or from siw_tx_thread context. Processing in
  * user context is limited to non-kernel verbs users.
  *
  * SQ processing may get paused anytime, possibly in the middle of a WR
  * or FPDU, if insufficient send space is available. SQ processing
- * gets resumed from siw_sq_work_handler(), if send space becomes
- * available again.
+ * gets resumed from siw_tx_thread, if send space becomes available again.
  *
  * Must be called with the QP state read-locked.
  *