Message style fixes

doc/src/sgml/catalogs.sgml

doc/src/sgml/perform.sgml

doc/src/sgml/ref/create_statistics.sgml

doc/src/sgml/ref/psql-ref.sgml

src/backend/access/transam/twophase.c

src/backend/access/transam/xlog.c

src/backend/commands/publicationcmds.c

src/backend/commands/statscmds.c

src/backend/commands/tablecmds.c

src/backend/commands/trigger.c

src/backend/executor/execReplication.c

src/backend/libpq/hba.c

src/backend/replication/logical/relation.c

src/backend/replication/logical/worker.c

src/backend/replication/pgoutput/pgoutput.c

src/backend/rewrite/rewriteDefine.c

src/backend/storage/lmgr/predicate.c

src/backend/utils/adt/int8.c

src/backend/utils/adt/jsonfuncs.c

src/backend/utils/adt/mac8.c