PBS-Go: Remove User Sync Default + Update Features (#3656)

prebid-server/developers/add-new-bidder-go.md

@@ -172,11 +172,10 @@ Prebid Server offers a federated [user sync](https://docs.prebid.org/prebid-serv
 
 The Bidder Info template above demonstrates configuration of a `redirect` user sync. The `url` points to an endpoint on your bidding server which will honor the privacy policies, replace the `userMacro` in the redirect url with the user's tracking id, and respond with an HTTP 302 redirect to that url. You may also specify an `iframe` endpoint which will return an HTML document to be rendered in an `iframe` on the user's device and use JavaScript to perform the redirect. You may omit the `{%raw%}{{.GDPR}}{%endraw%}`, `{%raw%}{{.GDPRConsent}}{%endraw%}`, and/or `{%raw%}{{.USPrivacy}}{%endraw%}` macros if they are not applicable to your legal situation.
 
-If both `iframe` and `redirect` endpoints are provided, you must specify a `default` field with a value of either `iframe` or `redirect`, based on your preference.
+If both `iframe` and `redirect` endpoints are provided, the `iframe` endpoint will be used by default.
 
 ```yaml
 userSync:
-  default: iframe
   iframe:
     url: https://foo.com/iframe/sync?gdpr={%raw%}{{.GDPR}}{%endraw%}&consent={%raw%}{{.GDPRConsent}}{%endraw%}&us_privacy={%raw%}{{.USPrivacy}}{%endraw%}&redirect={%raw%}{{.RedirectURL}}{%endraw%}
     userMacro: $UID
@@ -185,7 +184,7 @@ userSync:
     userMacro: $UID
 ```
 
-If your bid adapter supports user sync and doesn't have a good default, you may optionally specify a `supports` array with the items `iframe` and/or `redirect` to inform Prebid Server hosts. Hosts will receive a warning on startup if a bid adapter supports user sync and isn't configured. Expect hosts to contact you at the maintainer email address in this file for instructions.
+If your bid adapter supports user sync and doesn't have a good default endpoint, you may optionally specify a `supports` array with the items `iframe` and/or `redirect` to inform Prebid Server hosts. Hosts will receive a warning on startup if a bid adapter supports user sync and isn't configured. Expect hosts to contact you at the maintainer email address for instructions.
 
 ```yaml
 userSync:

prebid-server/features/pbs-feature-idx.md

@@ -63,7 +63,7 @@ title: Prebid Server | Features
 | [User ID Sync](/prebid-server/developers/pbs-cookie-sync.html) | Core | Implements the /cookie_sync and /setuid endpoints. Bidders may choose either redirect or iframe method. | <img src="/assets/images/icons/icon-check-green.png" width="30"> | <img src="/assets/images/icons/icon-check-green.png" width="30"> |
 | User ID Sync | Multi-Method | Bidders can supply both pixel redirects as well as iframe syncs. | <img src="/assets/images/icons/icon-check-green.png" width="30"> | <img src="/assets/images/icons/icon-check-green.png" width="30"> |
 | User ID Sync | Cooperative sync | Does a pixel sync with more than just the bidders on the page. | <img src="/assets/images/icons/icon-check-green.png" width="30"> | <img src="/assets/images/icons/icon-check-green.png" width="30"> |
-| User ID Sync | Account override | Allows accounts to override the cooperative sync feature and bidder limits. | | <img src="/assets/images/icons/icon-check-green.png" width="30"> |
+| User ID Sync | Account override | Allows accounts to override the cooperative sync feature and bidder limits. | <img src="/assets/images/icons/icon-check-green.png" width="30"> | <img src="/assets/images/icons/icon-check-green.png" width="30"> |
 | User ID | [EID Permissions](/prebid-server/endpoints/openrtb2/pbs-endpoint-auction.html#eid-permissions) | The Publisher can define which bidders receive which extended user IDs. | <img src="/assets/images/icons/icon-check-green.png" width="30"> | <img src="/assets/images/icons/icon-check-green.png" width="30"> |
 | [Events](https://docs.google.com/document/d/1ry0X4C2EV-R0pMrm1IQk9BstxaT395UCl3KKqTGa5c8/edit#heading=h.7w5yevygp2gz) | Events | Ability to process the /event endpoint, place /event URLs in the OpenRTB response, and place /event URLs in VAST XML. | <img src="/assets/images/icons/icon-check-green.png" width="30"> | <img src="/assets/images/icons/icon-check-green.png" width="30"> |
 | Events | Events vasttrack endpoint | Ability to process the /vasttrack endpoint initated by Prebid.js, placing /event URLs in VAST XML. | <img src="/assets/images/icons/icon-check-green.png" width="30"> | <img src="/assets/images/icons/icon-check-green.png" width="30"> |