Docs/admin-guide/mm/damon/usage: clarify quotas and watermarks sysfs interface

``nr_accesses``, and ``age``) each having two files (``min`` and ``max``)

exist.  You can set and get the access pattern for the given scheme by writing

to and reading from the ``min`` and ``max`` files under ``sz``,

``nr_accesses``, and ``age`` directories, respectively.

``nr_accesses``, and ``age`` directories, respectively.  Note that the ``min``

and the ``max`` form a closed interval.

schemes/<N>/quotas/

-------------------

You can set the ``time quota`` in milliseconds, ``size quota`` in bytes, and

``reset interval`` in milliseconds by writing the values to the three files,

respectively.  You can also set the :ref:`prioritization weights

respectively.  Then, DAMON tries to use only up to ``time quota`` milliseconds

for applying the ``action`` to memory regions of the ``access_pattern``, and to

apply the action to only up to ``bytes`` bytes of memory regions within the

``reset_interval_ms``.  Setting both ``ms`` and ``bytes`` zero disables the

quota limits.

You can also set the :ref:`prioritization weights

<damon_design_damos_quotas_prioritization>` for size, access frequency, and age

in per-thousand unit by writing the values to the three files under the

``weights`` directory.