[ci skip] Separated full stop from the Optimistic_concurrency_control wiki...

[ci skip] Separated full stop from the Optimistic_concurrency_control wiki link d4e3f8ba826cd42aa3c242149

activerecord/lib/active_record/validations/uniqueness.rb

@@ -198,7 +198,7 @@ module ClassMethods
       # can catch it and restart the transaction (e.g. by telling the user
       # that the title already exists, and asking him to re-enter the title).
       # This technique is also known as optimistic concurrency control:
-      # http://en.wikipedia.org/wiki/Optimistic_concurrency_control.
+      # http://en.wikipedia.org/wiki/Optimistic_concurrency_control .
       #
       # The bundled ActiveRecord::ConnectionAdapters distinguish unique index
       # constraint errors from other types of database errors by throwing an