Specify that us-east-1 region needs to be reachable for GHES for audit log streaming to S3 (#49900)

Author: AleBaccin

content/admin/monitoring-activity-in-your-enterprise/reviewing-audit-logs-for-your-enterprise/streaming-the-audit-log-for-your-enterprise.md

@@ -72,6 +72,14 @@ You set up the audit log stream on {% data variables.product.product_name %} by
 
 ### Setting up streaming to Amazon S3
 
+{% ifversion ghes %}
+{% note %}
+
+**Note**: The Amazon region `us-east-1` must be reachable from your appliance in order for streaming to S3 to work accordingly.
+
+{% endnote %}
+{% endif %}
+
 {% ifversion streaming-oidc-s3 %}
 You can set up streaming to S3 with access keys or, to avoid storing long-lived secrets in {% data variables.product.product_name %}, with OpenID Connect (OIDC).