fix proto comment (user.id and user.buyeruid) by tomill · Pull Request #141 · google/openrtb

This comment is probably based on 2.3.0. The field buyeruid of User was added from OpenRTB ver 2.0, but was incorrectly released as buyerid (not have u) in 2.3.0. This typo has been fixed as 2.3.1 ...