media: v4l: subdev: Fix typo in documentation

Replace the incorrect reference to the v4l2_subdev_enable_stream()
function with the correct v4l2_subdev_enable_streams() spelling.

Fixes: d0749adb ("media: v4l2-subdev: Add subdev .(enable|disable)_streams() operations")
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://lore.kernel.org/r/20240619225343.15873-1-laurent.pinchart@ideasonboard.comSigned-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

include/media/v4l2-subdev.h

@@ -690,7 +690,7 @@ struct v4l2_subdev_pad_config {
  *
  * @pad: pad number
  * @stream: stream number
- * @enabled: has the stream been enabled with v4l2_subdev_enable_stream()
+ * @enabled: has the stream been enabled with v4l2_subdev_enable_streams()
  * @fmt: &struct v4l2_mbus_framefmt
  * @crop: &struct v4l2_rect to be used for crop
  * @compose: &struct v4l2_rect to be used for compose