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blk-wbt: doc: Update the doc of the wbt_lat_usec interface

The symbol wb_window_usec cannot be found. Update the doc to reflect the
latest implementation, in other words, the debugfs interface
'curr_win_nsec'.

Signed-off-by: Tang Yizhou <yizhou.tang@shopee.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20250727173959.160835-4-yizhou.tang@shopee.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

authored by

Tang Yizhou and committed by
Jens Axboe 0452f083 bccdfcd5

+1 -1
+1 -1
Documentation/ABI/stable/sysfs-block
··· 731 731 Description: 732 732 [RW] If the device is registered for writeback throttling, then 733 733 this file shows the target minimum read latency. If this latency 734 - is exceeded in a given window of time (see wb_window_usec), then 734 + is exceeded in a given window of time (see curr_win_nsec), then 735 735 the writeback throttling will start scaling back writes. Writing 736 736 a value of '0' to this file disables the feature. Writing a 737 737 value of '-1' to this file resets the value to the default