* doc/globals.rdoc:  $? is thread-local


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39747 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-03-14

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39748 b2dd03c8-39d4-4d8f-98ff-823fe69b080e