rails/rails — pull request #13104 by christophemaximin (2013-11-29 14:58:14+00:00)
Title: Fix URL to robots.txt documentation

Quick fix:
http://www.robotstxt.org/wc/norobots.html is now 404, the new URL is http://www.robotstxt.org/robotstxt.html

(I don't think that qualifies for a CHANGELOG notice)