* lib/rdoc.rb:  Update to release version of 4.0.0

* lib/rubygems.rb:  Update to release version of 2.0.0


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39318 b2dd03c8-39d4-4d8f-98ff-823fe69b080e