psql: Improve describe footer titles for publications.

psql: Improve describe footer titles for publications.

The psql describe (`\d`) footer titles were previously unintuitive when
listing publications that included or excluded specific tables. Even
though the tag for included publications was pre-existing, it is better
to update it to "Included in publications:" to match the phrasing of
the "Excluded from publications:" tag.

Footer titles for sequence and schema descriptions have been updated
similarly to maintain consistency.

Reported-by: Álvaro Herrera <alvherre@kurilemu.de>
Author: Peter Smith <smithpb2250@gmail.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Reviewed-by: vignesh C <vignesh21@gmail.com>
Reviewed-by: Yuchen Li <liyuchen_xyz@163.com>
Discussion: https://postgr.es/m/aeDs7iZUox1bbKAK%40alvherre.pgsql