Add support pbs (#2710)

Co-authored-by: faithnh <[email protected]>

dev-docs/bidders/unicorn.md

@@ -3,6 +3,8 @@ layout: bidder
 title: UNICORN
 description: Prebid UNICORN Bidder Adaptor
 pbjs: true
+pbs: true
+pbs_app_supported: true
 media_types: banner
 biddercode: unicorn
 ---
@@ -14,7 +16,7 @@ biddercode: unicorn
 |---------------|----------|-------------------------------------------|------------|-----------|
 | `placementId` | optional | Your placement ID | `'rectangle-ad-1'` | `string`  |
 | `accountId` | required | Account ID for charge request (provided by UNICORN) | `12345`    | `integer` |
-| `bidfloorCpm` | optional | Floor CPM (JPY); defaults to 0.  | `0.2`    | `float` |
+| `bidfloorCpm` | optional for Prebid.js | Floor CPM (JPY); defaults to 0.  | `0.2`    | `float` |
 | `publisherId` | optional | Account specific publisher id. | `67890` | `integer` |
-| `mediaId` | optional | Publisher specific media id. | `'example'` | `string` |
-| `bcat` | optional | Blocked IAB categories | `['IAB-1', 'IAB-2']` | `[string]` |
+| `mediaId` | required for Prebid Server, optional for Prebid.js | Publisher specific media id. | `'example'` | `string` |
+| `bcat` | optional for Prebid.js  | Blocked IAB categories | `['IAB-1', 'IAB-2']` | `[string]` |