Docs/mm/damon/design: categorize DAMOS filter types based on handling layer

Docs/mm/damon/design: categorize DAMOS filter types based on handling layer

On what DAMON layer a DAMOS filter is handled is important to expect in
what order filters will be evaluated.  Re-organize the DAMOS filter types
list on the design doc to categorize types based on the handling layer, to
let users more easily understand the handling order.

Link: https://lkml.kernel.org/r/20250218223708.53437-6-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>