Update 33Across bidder documentation (#966)

* Add publisher usage docs for 33Across

* Added 33Across to partners list

* Clarified example pubID

* Reinstated changes that got lost during rebase

* 33across adapter is GDPR compliant

* update docs

dev-docs/bidders/33across.md

@@ -18,4 +18,4 @@ gdpr_supported: true
 | Name        | Scope    | Description                                                                                                                    | Example    | Type     |
 |-------------|----------|--------------------------------------------------------------------------------------------------------------------------------|------------|----------|
 | `siteId`    | required | Publisher  GUID from 33Across                                                                                                  | `'examplePub123'` | `string` |
-| `productId` | required | 33Across Product ID that the Publisher has registered for (use only 'siab' for the present since others are not supported yet) | `'siab'`   | `string` |
+| `productId` | required | 33Across Product ID that the Publisher has registered for (use `'siab'` for standard supply and `'inview'` for renderer) | `'siab'`   | `string` |