update doc.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@30554 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Added by yugui (Yuki Sonoda) almost 15 years ago
merges r30330 from trunk into ruby_1_9_2.¶
update doc.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@30554 b2dd03c8-39d4-4d8f-98ff-823fe69b080e