add `gdpr_supported: true` to orbidder doc (#4012)
add `gdpr_supported: true` to orbidder doc (#4012)

Co-authored-by: Hendrik Iseke <3a54931247059b1a4df0ca3a7584b77e85648ec0@gmx.de>
prebid/prebid.github.io,prebid/prebid.github.io,prebid/prebid.github.io