(fixes #3027)change a word in English version up document.
(fixes #3027)change a word in English version up document.

nise-nabe/ppcon-sns,tejima/OP3PKG,nise-nabe/ppcon-sns,openpne/OpenPNE3,tejima/OP3PKG,openpne/OpenPNE3,openpne/OpenPNE3,openpne/OpenPNE3