update docs to give correct parameter type

Author: marlier

docs/02-app/01-building-your-application/06-optimizing/12-third-party-libraries.mdx

@@ -168,13 +168,13 @@ different variables and events that can be passed into the function.
 Options to pass to the Google Tag Manager. For a full list of options, read the [Google Tag Manager
 docs](https://developers.google.com/tag-platform/tag-manager/datalayer).
 
-| Name            | Type     | Description                                                                     |
-| --------------- | -------- | ------------------------------------------------------------------------------- |
-| `gtmId`         | Required | Your GTM container ID. Usually starts with `GTM-`.                              |
-| `dataLayer`     | Optional | Data layer array to instantiate the container with. Defaults to an empty array. |
-| `dataLayerName` | Optional | Name of the data layer. Defaults to `dataLayer`.                                |
-| `auth`          | Optional | Value of authentication parameter (`gtm_auth`) for environment snippets.        |
-| `preview`       | Optional | Value of preview parameter (`gtm_preview`) for environment snippets.            |
+| Name            | Type     | Description                                                                       |
+| --------------- | -------- | --------------------------------------------------------------------------------- |
+| `gtmId`         | Required | Your GTM container ID. Usually starts with `GTM-`.                                |
+| `dataLayer`     | Optional | Data layer object to instantiate the container with. Defaults to an empty object. |
+| `dataLayerName` | Optional | Name of the data layer. Defaults to `dataLayer`.                                  |
+| `auth`          | Optional | Value of authentication parameter (`gtm_auth`) for environment snippets.          |
+| `preview`       | Optional | Value of preview parameter (`gtm_preview`) for environment snippets.              |
 
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