* file.c: [DOC] Add more documentation for File.basename by @avdi [fix GH-550][ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45200 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-02-28

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45201 b2dd03c8-39d4-4d8f-98ff-823fe69b080e