* lib/open-uri.rb: [DOC] use lower case version of core classes, same
  as commit r44878, based on patch by Jonathan Jackson [Bug #9483] [ci skip]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44879 b2dd03c8-39d4-4d8f-98ff-823fe69b080e