Criteo bid adapter: update uid type (prebid#5865)

* Update criteo.md

* Update criteo.md uid type

---------

Co-authored-by: Muki Seiler <muuki88@users.noreply.github.com>

Author: florianerl

dev-docs/bidders/criteo.md

@@ -37,7 +37,7 @@ Prebid-Server support is on alpha test and is currently a non-finished product.
 | `zoneId`          | optional, deprecated | (deprecated) The zone ID from Criteo. Should be replaced by `networkId` when using zone matching.                                    | `234234`                                      | `integer`  |
 | `networkId`       | required | The network ID from Criteo. Please reach out your Criteo representative for more details.                             | `456456`                                      | `integer`  |
 | `pubid`           | optional | Publisher id of your inventory group provided by your Technical account manager if using inventory groups to map your inventory in Commerce Grid | `'ABC123'` |  `string` |
-| `uid`             | optional | Ad Unit ID   | `'8888'` |  `string` |
+| `uid`             | optional | Ad Unit ID   | `8888` |  `integer` |
 | `nativeCallback`  | optional | (deprecated) (Prebid.js only) Callback to perform render in native integrations. Please reach out your Criteo representative for more details.     | `function(payload) { console.log(payload); }` | `function` |
 | `integrationMode` | optional | (Prebid.js only) Integration mode to use for ad render (none or 'AMP'). Please reach out your Criteo representative for more details. | `'AMP'`                                       | `string`   |
 | `publisherSubId`  | optional | Custom identifier for reporting. Please reach out your Criteo representative for more details. | `'adunit-1'` |  `string` |