Add [DOC] tag [ci skip]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44464 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-12-31

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44465 b2dd03c8-39d4-4d8f-98ff-823fe69b080e