Docs/admin-guide/mm/damon/usage: fix wrong quotas diabling condition

After the introduction of DAMOS quotas, DAMOS quotas is not disabled if
both size and time quotas are zero but the quota goal is set.  The new
rule is also applied to DAMON sysfs interface, but the usage doc is not
updated.  Update it.

Link: https://lkml.kernel.org/r/20240217005842.87348-6-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Documentation/admin-guide/mm/damon/usage.rst

@@ -329,7 +329,8 @@ 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.
+quota limits unless at least one :ref:`goal <sysfs_schemes_quota_goals>` is
+set.
 
 Under ``weights`` directory, three files (``sz_permil``,
 ``nr_accesses_permil``, and ``age_permil``) exist.