fix rdoc of dir [Bug #7729]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38916 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
fix rdoc of dir [Bug #7729]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38916 b2dd03c8-39d4-4d8f-98ff-823fe69b080e