Alter some gratuitous uses of "ANSI" when "SQL standard" might have been

doc/src/sgml/ecpg.sgml

src/backend/utils/adt/varchar.c

src/include/catalog/pg_type.h

src/pl/plpgsql/src/gram.y

src/test/regress/expected/select_distinct.out

src/test/regress/sql/select_distinct.sql