trustpid legacy doc (#4645)

* trustpid legacy doc

This was renamed in #4528 but we need the old name around for a transition period in case publishers have started using it.

* added version note

dev-docs/modules/userid-submodules/trustpid.md

@@ -0,0 +1,56 @@
+---
+layout: userid
+title: Trustpid
+description: Trustpid User ID sub-module
+pbjs_version_notes: not in 8.x
+useridmodule: trustpidSystem
+---
+
+{: .alert.alert-info :}
+This ID module has been renamed [utiq](/dev-docs/modules/userid-submodules/utiq.html) as of Prebid.js 8.0.
+
+Trustpid generates unique tokens, enabling improved efficiency in programmatic advertising while safeguarding transparency and control for end customers via `trustpid.com`. A website visitor’s Trustpid is generated based on network identifiers provided by network operators and requires explicit user consent.
+
+Trustpid is also the brand name of the service, which is provided by Vodafone Sales and Services Limited (“VSSL”).
+
+## Trustpid configuration
+
+{: .table .table-bordered .table-striped }
+| Param under userSync.userIds[] | Scope | Type | Description | Example |
+| --- | --- | --- | --- | --- |
+| name | Required | String | The name of the module | `"trustpid"`
+| params | Required | Object | Object with configuration parameters for trustpid User Id submodule | - |
+| params.maxDelayTime | Required | Integer | Max amount of time (in seconds) before looking into storage for data | 2500 |
+| bidders | Required | Array of Strings | An array of bidder codes to which this user ID may be sent. Currently required and supporting AdformOpenRTB | `['adf']` |
+| storage | Required | Object | Local storage configuration object | - |
+| storage.type | Required | String | Type of the storage that would be used to store user ID. Must be `"html5"` to utilise HTML5 local storage. | `"html5"` |
+| storage.name | Required | String | The name of the key in local storage where the user ID will be stored. | `"trustpid"` |
+| storage.expires | Required | Integer | How long (in days) the user ID information will be stored. For safety reasons, this information is required.| `1` |
+
+Configuration example:
+
+```javascript
+pbjs.setConfig({
+  userSync: {
+    userIds: [
+      {
+        name: "trustpid",
+        params: {
+          maxDelayTime: 2500,
+        },
+        bidders: ["adf"],
+        storage: {
+          type: "html5",
+          name: "trustpid",
+          expires: 1,
+        },
+      }],
+    syncDelay: 3000,
+    auctionDelay: 3000
+  }
+});
+```
+
+## Truspid onboarding
+
+If you wish to find out more about Trustpid, please contact onboarding@trustpid.com