Docs/mm/damon/maintainer-profile: use flexible review cadence

The document mentions the maitainer is working in the usual 9-5 fashion. 
The maintainer nowadays prefers working in a more flexible way.  Update
the document to avoid contributors having a wrong time expectation.

Link: https://lkml.kernel.org/r/20260307195356.203753-7-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Acked-by: wang lian <lianux.mm@gmail.com>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <davidgow@google.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Documentation/mm/damon/maintainer-profile.rst

@@ -63,10 +63,10 @@ management subsystem maintainer.
 Review cadence
 --------------
 
-The DAMON maintainer does the work on the usual work hour (09:00 to 17:00,
-Mon-Fri) in PT (Pacific Time).  The response to patches will occasionally be
-slow.  Do not hesitate to send a ping if you have not heard back within a week
-of sending a patch.
+The DAMON maintainer usually work in a flexible way, except early morning in PT
+(Pacific Time).  The response to patches will occasionally be slow.  Do not
+hesitate to send a ping if you have not heard back within a week of sending a
+patch.
 
 Mailing tool
 ------------