core: Add documentation of "sg" field in the dwc3_request struct.

Signed-off-by: Jonathan Velez <jonvelez12345@gmail.com>
---
 drivers/usb/dwc3/core.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index f11570c8ffd0..bb140dde07d6 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -942,6 +942,7 @@ struct dwc3_hwparams {
  * @request: struct usb_request to be transferred
  * @list: a list_head used for request queueing
  * @dep: struct dwc3_ep owning this request
+ * @sg: pointer to the scatter-gather list for transfers
  * @start_sg: pointer to the sg which should be queued next
  * @num_pending_sgs: counter to pending sgs
  * @remaining: amount of data remaining
-- 
2.43.0