mm/damon: update expired description of damos_action

Nowadays, damos operation actions support a greater operation set.  But
comments (also, generated documentation) weren't updated.  So fix the
comments with current support status.

Link: https://lkml.kernel.org/r/20250805123940.13691-1-ekffu200098@gmail.com


Signed-off-by: Sang-Heon Jeon <ekffu200098@gmail.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: Honggyu Kim <honggyu.kim@sk.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>