[PATCH 3/4] Docs/ABI/damon: document update_tuned_intervals state command

[Song Hu <husong@kylinos.cn>]

The 'update_tuned_intervals' command of the 'state' file, added in
commit 1077605396b4 ("mm/damon/sysfs: implement a command to update
auto-tuned monitoring intervals"), is described in usage.rst but
missing from the canonical ABI document.  Add it.

Signed-off-by: Song Hu <husong@kylinos.cn>
---
 Documentation/ABI/testing/sysfs-kernel-mm-damon | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/ABI/testing/sysfs-kernel-mm-damon b/Documentation/ABI/testing/sysfs-kernel-mm-damon
index 03aecc07a5bd..7e8192527191 100644
--- a/Documentation/ABI/testing/sysfs-kernel-mm-damon
+++ b/Documentation/ABI/testing/sysfs-kernel-mm-damon
@@ -36,7 +36,10 @@ Description:	Writing 'on' or 'off' to this file makes the kdamond starts or
 		kdamond.  Writing 'clear_schemes_tried_regions' to the file
 		removes contents of the 'tried_regions' directory.  Writing
 		'update_schemes_effective_quotas' to the file updates
-		'.../quotas/effective_bytes' files of this kdamond.
+		'.../quotas/effective_bytes' files of this kdamond.  Writing
+		'update_tuned_intervals' to the file updates 'sample_us' and
+		'aggr_us' files under 'monitoring_attrs/intervals' with the
+		auto-tuned sampling and aggregation intervals.
 
 What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/pid
 Date:		Mar 2022
-- 
2.43.0