pgsql: Improve some messages

Improve some messages

Branch
------
REL9_5_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/0fc7c4a557752652ebddddb55ad11228129b530e

Modified Files
--------------
src/backend/access/transam/commit_ts.c       |    2 +-
src/backend/catalog/objectaddress.c          |    2 +-
src/backend/commands/policy.c                |    4 ++--
src/backend/commands/user.c                  |    2 +-
src/backend/executor/nodeCustom.c            |    4 ++--
src/backend/utils/adt/jsonb.c                |    4 ++--
src/backend/utils/adt/jsonfuncs.c            |    2 +-
src/test/regress/expected/jsonb.out          |    2 +-
src/test/regress/expected/object_address.out |    2 +-
9 files changed, 12 insertions(+), 12 deletions(-)