* lib/rss/atom.rb: Documentation for RSS::Atom based on a patch by
  Michael Denomy
* lib/rss/maker.rb: Documentation for RSS::Maker also by @mdenomy


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40475 b2dd03c8-39d4-4d8f-98ff-823fe69b080e