Message style tweaks

src/backend/commands/tablecmds.c

src/backend/parser/parse_utilcmd.c

src/backend/port/win32/crashdump.c

src/backend/storage/lmgr/predicate.c

src/backend/utils/adt/varlena.c

src/backend/utils/misc/guc.c

src/test/regress/expected/foreign_data.out

src/test/regress/expected/text.out

src/test/regress/sql/foreign_data.sql