Docs/admin-guide/mm/damon/usage: update for tried_regions/total_bytes

Update the DAMON usage document for newly added
schemes/.../tried_regions/total_bytes file and the
update_schemes_tried_bytes command.

Link: https://lkml.kernel.org/r/20230802213222.109841-6-sj@kernel.org


Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>