Docs/ABI/damon: document DAMOS sysfs files to set the min/max folio_size

This will be used to decide the min and max folio size to operate on for
pa_stat.

Link: https://lkml.kernel.org/r/20250211124437.278873-4-usamaarif642@gmail.com


Signed-off-by: Usama Arif <usamaarif642@gmail.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>