fix a typo
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41221 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
fix a typo
http://d.hatena.ne.jp/nagachika/20130610/ruby_trunk_changes_41199_41220
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41221 b2dd03c8-39d4-4d8f-98ff-823fe69b080e