Fix tab-completion after commit 790bf615ddba

Fix tab-completion after commit 790bf615ddba

I (Álvaro) broke tab-completion for GRANT .. ALL TABLES IN SCHEMA while
removing ALL from the publication syntax for schemas in the
aforementioned commit.  I also missed to update a bunch of
tab-completion rules for ALTER/CREATE PUBLICATION that match each
individual piece of ALL TABLES IN SCHEMA.  Repair those bugs.

While fixing up that commit, update a couple of outdated comments
related to the same change.

Backpatch to 15.

Author: Shi yu <shiy.fnst@fujitsu.com>
Reviewed-by: Peter Smith <smithpb2250@gmail.com>
Discussion: https://postgr.es/m/OSZPR01MB6310FCE8609185A56344EED2FD559@OSZPR01MB6310.jpnprd01.prod.outlook.com