Message improvements

src/backend/access/transam/parallel.c

src/backend/access/transam/xlog.c

src/backend/catalog/objectaddress.c

src/backend/commands/copy.c

src/backend/commands/extension.c

src/backend/commands/tablecmds.c

src/backend/commands/tablespace.c

src/backend/libpq/auth.c

src/backend/libpq/pqcomm.c

src/backend/parser/parse_agg.c

src/backend/parser/parse_clause.c

src/backend/parser/parse_relation.c

src/backend/postmaster/postmaster.c

src/backend/storage/lmgr/lwlock.c

src/backend/utils/adt/array_userfuncs.c

src/backend/utils/adt/encode.c

src/backend/utils/adt/jsonb.c

src/backend/utils/misc/guc.c

src/backend/utils/misc/rls.c

src/port/win32error.c