rails/docrails — pull request #157 by ankit8898 (2013-07-04 07:33:43+00:00)
Title: Fixing Optimistic concurrency control wikipedia link

Because of full stop with link it is forming the link with a fullstop ( http://en.wikipedia.org/wiki/Optimistic_concurrency_control.) which does not exist. The error can be seen here http://api.rubyonrails.org/classes/ActiveRecord/Validations/ClassMethods.html#method-i-validates_uniqueness_of