* complax.c: [DOC] Document number conversion of `nil` by @skade [fix GH-570] [ci skip]

* object.c, rational.c: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45375 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-03-21

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45376 b2dd03c8-39d4-4d8f-98ff-823fe69b080e