extension.rdoc: RB_TYPE_P [ci skip]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55042 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
extension.rdoc: RB_TYPE_P [ci skip]
[DOC] mention RB_TYPE_P.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55042 b2dd03c8-39d4-4d8f-98ff-823fe69b080e