* class.c: Example of Object#methods by @windwiny [Fixes GH-293]
* ruby.c: Document return values of Kernel #sub, #gsub, and #chop


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40432 b2dd03c8-39d4-4d8f-98ff-823fe69b080e