Criteo - added tcf2_supported to adapter documentation (prebid#1967)

Author: leonardlabat

dev-docs/bidders/criteo.md

@@ -8,6 +8,7 @@ media_types: display, native, video
 gdpr_supported: true
 usp_supported: true
 prebid_member: true
+tcf2_supported: true
 ---
 ### Note
 {: .alert.alert-warning :}