Docs/damon/maintainer-profile: document Google calendar for bi-weekly meetups

We added a public Google calendar for easy sharing of DAMON bi-weekly
meetups[1].  Add it to the official document for a better visibility.

[1] https://lore.kernel.org/all/20240717235812.53087-1-sj@kernel.org/

Link: https://lkml.kernel.org/r/20240826015741.80707-4-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: Alex Shi <alexs@kernel.org>
Cc: Hu Haowen <2023002089@link.tyut.edu.cn>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Yanteng Si <siyanteng@loongson.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Documentation/mm/damon/maintainer-profile.rst

@@ -99,5 +99,7 @@ time slot, by reaching out to the maintainer.
 
 Schedules and available reservation time slots are available at the Google `doc
 <https://docs.google.com/document/d/1v43Kcj3ly4CYqmAkMaZzLiM2GEnWfgdGbZAH3mi2vpM/edit?usp=sharing>`.
-DAMON maintainer will also provide periodic reminder to the mailing list
-(damon@lists.linux.dev).
+There is also a public Google `calendar
+<https://calendar.google.com/calendar/u/0?cid=ZDIwOTA4YTMxNjc2MDQ3NTIyMmUzYTM5ZmQyM2U4NDA0ZGIwZjBiYmJlZGQxNDM0MmY4ZTRjOTE0NjdhZDRiY0Bncm91cC5jYWxlbmRhci5nb29nbGUuY29t>`
+that has the events.  Anyone can subscribe it.  DAMON maintainer will also
+provide periodic reminder to the mailing list (damon@lists.linux.dev).