[COMMITTERS] 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
-------
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(-)