Update data-forwarding.mdx (#3599)

Clarifies that only errors are supported and not transactions.

Author: jeremybourque

src/docs/product/data-management-settings/data-forwarding.mdx

@@ -8,12 +8,14 @@ redirect_from:
 description: "Learn about forwarding processed events to third-party providers."
 ---
 
-Sentry provides the ability to forward processed events to certain third-party providers, such as [Segment](https://segment.com) and [Amazon SQS](https://aws.amazon.com/sqs/).
+Sentry provides the ability to forward processed error events to certain third-party providers, such as [Segment](https://segment.com) and [Amazon SQS](https://aws.amazon.com/sqs/).
 
 This is often useful when you may want to analyze exceptions more deeply, or empower other teams, such as a Business Intelligence function.
 
 Configure Data Forwarding by navigating to your **[Project] » Settings » Data Forwarding**, then providing the required information for the given integration.
 
+Only error events will be forwarded. Forwarding of transaction events is not supported.
+
 ## Amazon SQS
 
 Integration with Amazon SQS makes it quick and easy to pipe exceptions back into your own systems.