another set of cleanups

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

src/backend/parser/gram.y

src/bin/psql/command.c

src/bin/psql/command.h

src/bin/psql/common.c

src/bin/psql/common.h

src/bin/psql/copy.c

src/bin/psql/copy.h

src/bin/psql/describe.c

src/bin/psql/describe.h

src/bin/psql/help.c

src/bin/psql/help.h

src/bin/psql/input.c

src/bin/psql/input.h

src/bin/psql/large_obj.c

src/bin/psql/large_obj.h

src/bin/psql/mainloop.c

src/bin/psql/mainloop.h

src/bin/psql/print.c

src/bin/psql/print.h