update copyright notice

update copyright notice

SCCS-vsn: usr.bin/more/README 5.2
SCCS-vsn: usr.bin/more/ch.c 5.5
SCCS-vsn: usr.bin/more/cmd.h 5.2
SCCS-vsn: usr.bin/more/command.c 5.6
SCCS-vsn: usr.bin/more/decode.c 5.4
SCCS-vsn: usr.bin/more/help.c 5.4
SCCS-vsn: usr.bin/more/input.c 5.2
SCCS-vsn: usr.bin/more/more.1 5.3
SCCS-vsn: usr.bin/more/less.h 5.6
SCCS-vsn: usr.bin/more/lesskey.1 5.2
SCCS-vsn: usr.bin/more/lesskey.c 5.3
SCCS-vsn: usr.bin/more/line.c 5.2
SCCS-vsn: usr.bin/more/linenum.c 5.4
SCCS-vsn: usr.bin/more/main.c 5.7
SCCS-vsn: usr.bin/more/option.c 5.5
SCCS-vsn: usr.bin/more/os.c 5.8
SCCS-vsn: usr.bin/more/output.c 5.4
SCCS-vsn: usr.bin/more/position.c 5.2
SCCS-vsn: usr.bin/more/position.h 5.2
SCCS-vsn: usr.bin/more/prim.c 5.4
SCCS-vsn: usr.bin/more/prompt.c 5.4
SCCS-vsn: usr.bin/more/screen.c 5.3
SCCS-vsn: usr.bin/more/signal.c 5.4
SCCS-vsn: usr.bin/more/tags.c 5.3
SCCS-vsn: usr.bin/more/ttyin.c 5.2
SCCS-vsn: usr.bin/more/vecho.c 5.2
SCCS-vsn: usr.bin/more/version.c 5.2