update adunit reference to cover https://github.com/prebid/Prebid.js/pull/8833 (#3969)
update adunit reference to cover https://github.com/prebid/Prebid.js/pull/8833 (#3969)

Co-authored-by: René Baudisch <32fcaea5326ad2df79d9095fabe09f771596154c@axelspringer.com>
prebid/prebid.github.io,prebid/prebid.github.io,prebid/prebid.github.io