Update comments.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41573 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-06-23

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41574 b2dd03c8-39d4-4d8f-98ff-823fe69b080e