Docs/admin-guide/mm/damon/usage: omit DAMOS filter details in favor of design doc

DAMON usage document is describing some details about DAMOS filters, which
are also documented on the design doc.  Deduplicate the details in favor
of the design doc.

Link: https://lkml.kernel.org/r/20250109175126.57878-10-sj@kernel.org


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