Merge pull request #7016 from segmentio/kurt-lu-patch-1

Update dbt.md

Author: forstisabella

src/segment-app/extensions/dbt.md

@@ -48,7 +48,10 @@ To set up dbt Cloud:
 
 1. In your Segment workspace, navigate to **Settings > Extensions**.
 2. Click **Manage dbt Cloud**.
-3. Add your dbt Cloud API key, and, optionally, a custom subdomain. Click **Save**.
+3. Add your dbt Cloud API key or dbt Personal Access Token and an optional custom subdomain, then click **Save**. 
+
+> info "Add a custom subdomain" 
+> By default, dbt sets the subdomain to 'cloud'. To identify your custom subdomain, open your URL and copy the portion before `.getdbt.com`. For example, if your domain was `https://subdomain.getdbt.com/`, your subdomain would be `subdomain`. 
 
 ### Model syncs
 
@@ -65,4 +68,4 @@ After you've successfully set up dbt with a warehouse and connected to your Git
 5. Click **Next**.
 6. Enter your **Model Name**, then click **Create Model**.
 
-To change a connected model, ensure that you've removed it from all active Reverse ETL syncs.
+To change a connected model, ensure that you've removed it from all active Reverse ETL syncs.