Docs/mm/damon/maintainer-profile: fix typos and grammar errors

Fix a few typos and grammar erros in DAMON Maintainer Profile document.

Link: https://lkml.kernel.org/r/20230525214314.5204-3-sj@kernel.org


Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>