Docs/ABI/damon: document effective_bytes sysfs file

Update the DAMON ABI doc for the effective_bytes sysfs file and the
kdamond state file input command for updating the content of the file.

Link: https://lkml.kernel.org/r/20240219194431.159606-5-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Documentation/ABI/testing/sysfs-kernel-mm-damon

@@ -34,7 +34,9 @@ Description:	Writing 'on' or 'off' to this file makes the kdamond starts or
 		kdamond.  Writing 'update_schemes_tried_bytes' to the file
 		updates only '.../tried_regions/total_bytes' files of this
 		kdamond.  Writing 'clear_schemes_tried_regions' to the file
-		removes contents of the 'tried_regions' directory.
+		removes contents of the 'tried_regions' directory.  Writing
+		'update_schemes_effective_quotas' to the file updates
+		'.../quotas/effective_bytes' files of this kdamond.
 
 What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/pid
 Date:		Mar 2022
@@ -208,6 +210,12 @@ Contact:	SeongJae Park <sj@kernel.org>
 Description:	Writing to and reading from this file sets and gets the size
 		quota of the scheme in bytes.
 
+What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/quotas/effective_bytes
+Date:		Feb 2024
+Contact:	SeongJae Park <sj@kernel.org>
+Description:	Reading from this file gets the effective size quota of the
+		scheme in bytes, which adjusted for the time quota and goals.
+
 What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/quotas/reset_interval_ms
 Date:		Mar 2022
 Contact:	SeongJae Park <sj@kernel.org>