rdoc for r57126 [ci skip]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57129 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
rdoc for r57126 [ci skip]
[Feature #13020]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57129 b2dd03c8-39d4-4d8f-98ff-823fe69b080e