Update userId.md (#2739)

dev-docs/modules/userId.md

@@ -1705,7 +1705,7 @@ pbjs.getUserIdsAsEids() // returns userIds in ORTB Eids format. e.g.
 
 ## Passing UserIds to Google Ad Manager for targeting
 
-User IDs from Prebid User ID module can be passed to GAM for targeting in Google Ad Manager or to pass ahead in Google Exchange Bidding using ```userIdTargeting``` module. More details can be found [here](https://github.com/prebid/Prebid.js/blob/master/modules/userIdTargeting.md). In short, you just need to add the optional userIdTargeting sub-module into your `gulp build` command and the additional `userIdTargeting` config becomes available.
+User IDs from Prebid User ID module can be passed to GAM for targeting in Google Ad Manager or could be passed ahead to Google Open Bidding using ```userIdTargeting``` module. Note Google deprecated the ability to pass key values, including identifiers, to OB partners and then later began a closed beta to resume it with details non-public (see  https://developers.google.com/authorized-buyers/rtb/request-guide ). More details on the user id module can be found [here](https://github.com/prebid/Prebid.js/blob/master/modules/userIdTargeting.md). In short, you just need to add the optional userIdTargeting sub-module into your `gulp build` command and the additional `userIdTargeting` config becomes available.
 
 ## Further Reading