add groupchanged param docs

Author: Eyvaz Ahmadzada

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

@@ -41,7 +41,7 @@ Please find below list of parameters that could be used in configuring Intent IQ
 | params.partner                 | Required | Number   | This is the partner ID value obtained from registering with IntentIQ.                                                                                                                                                                                                                                                                     | `1177538`                                     |
 | params.pcid                    | Optional | String   | This is the partner cookie ID, it is a dynamic value attached to the request.                                                                                                                                                                                                                                                             | `"g3hC52b"`                                   |
 | params.pai                     | Optional | String   | This is the partner customer ID / advertiser ID, it is a dynamic value attached to the request.                                                                                                                                                                                                                                           | `"advertiser1"`                               |
-| params.callback                | Optional | Function | This is a callback which is trigered with data and AB group                                                                                                                                                                                                                                                                               | `(data, group) => console.log({ data, group })` |
+| params.callback                | Optional | Function | This is a callback which is trigered with data                                                                                                                                                                                                                                                                               | `(data) => console.log({ data })` |
 | params.timeoutInMillis         | Optional | Number   | This is the timeout in milliseconds, which defines the maximum duration before the callback is triggered. The default value is 500.                                                                                                                                                                                                       | `450`                                         |
 | params.browserBlackList        | Optional | String   | This is the name of a browser that can be added to a blacklist.                                                                                                                                                                                                                                                                           | `"chrome"`                                    |
 | params.manualWinReportEnabled  | Optional | Boolean  | This variable determines whether the bidWon event is triggered automatically. If set to false, the event will occur automatically, and manual reporting with reportExternalWin will be disabled. If set to true, the event will not occur automatically, allowing manual reporting through reportExternalWin. The default value is false. | `true`                                        |
@@ -56,6 +56,8 @@ Please find below list of parameters that could be used in configuring Intent IQ
 | params.reportingServerAddress  | Optional | String   | The base URL for the IntentIQ reporting server. If parameter is provided in `configParams`, it will be used.                                                                                                                                                                                                                              | `"https://domain.com"`                        |
 | params.reportMethod            | Optional | String   | Defines the HTTP method used to send the analytics report. If set to `"POST"`, the report payload will be sent in the body of the request. If set to `"GET"` (default), the payload will be included as a query parameter in the request URL.                                                                                             |`"GET"`                                        |
 
+| params.groupChanged             | Optional | Function | A callback that is triggered every time the user’s A/B group is set or updated.                                                                                         |`(group) => console.log('Group changed:', group)` |
+
 
 
 ### Configuration example
@@ -69,7 +71,8 @@ pbjs.setConfig({
                 partner: 123456,     // valid partner id
                 timeoutInMillis: 500,
                 browserBlackList: "chrome",
-                callback: (data, group) => {...}, // your logic here
+                callback: (data) => {...}, // your logic here
+                groupChanged: (group) => console.log('Group is', group),
                 manualWinReportEnabled: true,
                 domainName: "currentDomain.com",
                 gamObjectReference: googletag,