This commit documents the usage of DAMON_LRU_SORT for admins.

Link: https://lkml.kernel.org/r/20220613192301.8817-10-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>