Add section covering tracking UTM parameters

Author: bobbyatsegment

src/connections/destinations/catalog/actions-google-analytics-4-web/index.md

@@ -68,3 +68,10 @@ The **Page Views** advanced setting prevents sending the `page_view` included in
 
 1. Disable the **Page Views** advanced setting (set it to *False*) so only Segment's `analytics.page()` sends to the GA4 SDK. Or,
 2.  Edit or disable the preset **Set Configuration Fields** mapping so only the `page_view` included in the gtag.js snippet sends to the GA4 SDK.
+
+### Tracking UTM Parameters
+
+UTM Parameters are automatically tracked and sent to Google when they are present in the URL. For example, with the following URL:
+`https://www.example.com/?utm_content=email_variation1&utm_medium=email&utm_source=email_promo&utm_campaign=summer_sale&utm_id=abcd`
+
+Without any further configuration, traffic-source data for `campaign`, `campaign_id`, `content`, `medium`, and `source` will populate in GA4. This can be observed on Google's side by triggering a `Page` call with UTM parameters present in the URL and navigating to the **Realtime overview** report in GA4 to see the resulting `page_view` event under the _Event count by Event name_ card.