Message style improvements

contrib/test_decoding/expected/binary.out

src/backend/access/transam/multixact.c

src/backend/catalog/dependency.c

src/backend/catalog/objectaddress.c

src/backend/commands/copy.c

src/backend/commands/matview.c

src/backend/commands/tablecmds.c

src/backend/commands/tablespace.c

src/backend/commands/vacuumlazy.c

src/backend/executor/execMain.c

src/backend/parser/parse_clause.c

src/backend/replication/logical/logicalfuncs.c

src/backend/replication/logical/origin.c

src/backend/replication/logical/snapbuild.c

src/backend/replication/slot.c

src/backend/tcop/postgres.c

src/backend/utils/adt/jsonb.c

src/backend/utils/adt/misc.c

src/bin/psql/command.c

src/test/modules/test_rls_hooks/expected/test_rls_hooks.out