Start.io: documentation updated (#6492)

* Update Start.io bidder documentation: add GPP and user sync support, enhance examples

* Fix table formatting in Start.io bidder documentation for userSync parameters

* Update Start.io bidder docs: mark GPP as unsupported

Author: IlliaMil

dev-docs/bidders/startio.md

@@ -6,6 +6,7 @@ description: Prebid Start.io Adapter
 tcfeu_supported: true
 coppa_supported: true
 gpp_supported: false
+userIds: startioId
 floors_supported: true
 media_types: banner, video, native
 multiformat_supported: will-bid-on-any
@@ -15,7 +16,7 @@ gvl_id: 1216
 usp_supported: true
 pbjs: true
 pbs: true
-prebid_member: false
+prebid_member: true
 fpd_supported: false
 privacy_sandbox: no
 ortb_blocking_supported: true
@@ -29,41 +30,144 @@ The Start.io bidder adapter requires additional setup and approval from the Star
 ### Bid Params
 
 {: .table .table-bordered .table-striped }
-| Name          | Scope    | Description                       | Example                | Type         |
-|---------------|----------|-----------------------------------|------------------------|--------------|
-| `publisherId` | required | Publisher ID                      | `'publisher-1234'`     | `string`     |
+
+| Name | Scope | Description | Example | Type |
+| --- | --- | --- | --- | --- |
+| `publisherId` | required | Publisher ID | `'publisher-1234'` | `string` |
+| `testAdsEnabled` | optional | Enable test ads during development | `true` | `boolean` |
 
 #### Configuration
 
-Sample banner setup:
+##### Banner
 
 ```js
 var adUnits = [
   {
-    code: "div-gpt-ad-12345-0",
+    code: 'test-div',
     mediaTypes: {
       banner: {
-        sizes: [[300, 250]]
+        sizes: [[300, 250], [728, 90]]
       }
     },
     bids: [
       {
-        bidder: "startio",
+        bidder: 'startio',
         params: {
-          publisherId: "publisher-12345"
+          publisherId: 'your-account-id',
+          testAdsEnabled: true
         }
       }
     ]
   }
-]
+];
+```
+
+##### Instream Video
 
-pbjs.que.push(function() {
-  pbjs.addAdUnits(adUnits);
+```js
+var videoAdUnits = [
+  {
+    code: 'test-div-video',
+    mediaTypes: {
+      video: {
+        context: 'instream',
+        placement: 1,
+        playerSize: [640, 360],
+        mimes: ['video/mp4'],
+        protocols: [2, 3, 5, 6],
+        api: [2],
+        maxduration: 30,
+        linearity: 1,
+        playbackmethod: [2]
+      }
+    },
+    bids: [
+      {
+        bidder: 'startio',
+        params: {
+          publisherId: 'your-account-id',
+          testAdsEnabled: true
+        }
+      }
+    ]
+  }
+];
+```
+
+##### Native
+
+```js
+var nativeAdUnits = [
+  {
+    code: 'test-div-native',
+    mediaTypes: {
+      native: {
+        title: { required: true, len: 80 },
+        body: { required: true },
+        image: { required: true, sizes: [150, 150] },
+        icon: { required: false, sizes: [50, 50] },
+        sponsoredBy: { required: true }
+      }
+    },
+    bids: [
+      {
+        bidder: 'startio',
+        params: {
+          publisherId: 'your-account-id',
+          testAdsEnabled: true
+        }
+      }
+    ]
+  }
+];
+```
+
+### User Sync and User ID Module
+
+The Start.io User ID submodule generates and persists a unique user identifier by fetching it from a Start.io-managed endpoint. The ID is stored in both cookies and local storage for subsequent page loads and is made available to other Prebid.js modules via the standard `eids` interface.
+
+To enable iframe-based user syncing and the Start.io User ID module, include the following configuration:
+
+```javascript
+pbjs.setConfig({
+    userSync: {
+        userIds: [{
+            name: 'startioId',
+            storage: {
+                type: 'cookie&html5',
+                name: 'startioId',
+                expires: 90
+            }
+        }],
+        filterSettings: {
+            iframe: {
+                bidders: ['startio'],
+                filter: 'include'
+            }
+        }
+    }
 });
 ```
 
+For integration support, contact <prebid@start.io>.
+
+#### User ID Parameters
+
+{: .table .table-bordered .table-striped }
+
+| Param under userSync.userIds[] | Scope | Type | Description | Example |
+| --- | --- | --- | --- | --- |
+| `name` | required | String | The name of this module. | `"startioId"` |
+| `storage` | required | Object | Storage configuration for the user ID. | |
+| `storage.type` | required | String | Type of storage: `"cookie"`, `"html5"`, or `"cookie&html5"`. | `"cookie&html5"` |
+| `storage.name` | required | String | The name used to store the user ID. | `"startioId"` |
+| `storage.expires` | optional | Number | Number of days before the stored ID expires. Defaults to `90`. | `90` |
+
 ### Additional Notes
 
 #### Request and Response Attributes
 
 - Bids are returned in **net** - that is, the bids returned reflect the bid amount with revenue sharing already taken into account. No adjustment is necessary.
+- The adapter processes requests via OpenRTB 2.5 standards.
+- Ensure that the `publisherId` parameter is set correctly for your integration.
+- Test ads can be enabled using `testAdsEnabled: true` during development.