rails/rails — pull request #16661 by edogawaconan (2014-08-23 15:14:31+00:00)
Title: Update documentation to match change in #5942 [ci skip]

I'm not sure how to style it though.

(Extra bit)
And looking again, it's weird because the validation is set on `attribute` but the error is set on different attribute: `attribute_confirmation` - inconsistent with other built in validations as far as I can tell.