improve examples, fix one improbably should_not value
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58789 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
improve examples, fix one improbably should_not value
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58789 b2dd03c8-39d4-4d8f-98ff-823fe69b080e