Update file-format.md with linkType details

Changes per AN-326503

src/pages/guides/endpoints/bulk-data-insertion/file-format.md

@@ -96,7 +96,7 @@ Column header name | `queryString` equivalent | Description
 `javaEnabled` | `v` | The [Java enabled](https://experienceleague.adobe.com/docs/analytics/components/dimensions/java-enabled.html) dimension.
 `language` | N/A (Only available with column header) | The [Language](https://experienceleague.adobe.com/docs/analytics/components/dimensions/language.html) dimension.
 `linkName` | `pev2` | The [Download link](https://experienceleague.adobe.com/docs/analytics/components/dimensions/download-link.html), [Exit link](https://experienceleague.adobe.com/docs/analytics/components/dimensions/exit-link.html), or [Custom link](https://experienceleague.adobe.com/docs/analytics/components/dimensions/custom-link.html) dimension, depending on the value in the `linkType` column. If this column contains a value, `pageName` is ignored.
-`linkType` | `pe` | The type of link. Defaults to `o` if this field is empty and `linkName` contains a value. Valid values include:<br/> **`d`**: Download link<br/>**`e`**: Exit link<br/>**`o`**: Custom link
+`linkType` | `pe` | The type of link. Defaults to `o` if this field is empty and `linkName` contains a value. Valid values when using the `linkType` column include:<br/><br/> **`d`**: Download link<br/>**`e`**: Exit link<br/>**`o`**: Custom link. <br/> <br/> When using the `pe` query string use `lnk_d`, `lnk_e`, and `lnk_o` respectively.
 `linkURL` | `pev1` | The link URL.
 `list1` - `list3` | `l1` - `l3` | [List variables](https://experienceleague.adobe.com/docs/analytics/implementation/vars/page-vars/list.html).
 `marketingCloudVisitorID` | `mid` | The unique identifier used with the [Adobe Experience Cloud Identity Servce](https://experienceleague.adobe.com/docs/id-service/using/home.html).