API Shield docs updates

Author: db-cloudflare

src/content/docs/security/web-assets.mdx

@@ -33,6 +33,10 @@ For more information on how to manage your endpoints, refer to the following res
 
 [Add endpoints](/api-shield/management-and-monitoring/#add-endpoints-from-api-discovery) to produce recommendations and analytics of your APIs. Your [session identifiers](/api-shield/management-and-monitoring/session-identifiers/) must match your API traffic. Otherwise, API endpoints are also discoverable via [Machine Learning](/api-shield/security/api-discovery/#machine-learning-based-discovery).
 
+:::note
+**Discovery** is only available for Enterprise customers. If you are an Enterprise customer and interested in this product, contact your account team.
+:::
+
 ## Sequences
 
 Use **Sequences** to discover how users interact with your API, by tracking the order of API session requests over time. Sequences will group and highlight popular user journeys across your API.