pgsql: Add more documentation and tests for publications

Add more documentation and tests for publications

Add/correct documentation and add some tests related to how access
control around adding tables to publications works.

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/e76db009f079ece9408e37336887bc6457cc1fc6

Modified Files
--------------
doc/src/sgml/logical-replication.sgml | 6 ++++++
doc/src/sgml/ref/create_publication.sgml | 6 +++---
src/test/regress/expected/publication.out | 20 +++++++++++++++++++-
src/test/regress/sql/publication.sql | 24 +++++++++++++++++++++++-
4 files changed, 51 insertions(+), 5 deletions(-)

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