Add the billing implication of sending product analytics server-side events (#3792)

Co-authored-by: ci.datadog-api-spec <packages@datadoghq.com>

Author: api-clients-generation-pipeline[bot]

.generator/schemas/v2/openapi.yaml

@@ -110586,7 +110586,9 @@ tags:
       Send server-side events to Product Analytics. Server-Side Events Ingestion allows you to collect custom events
       from any server-side source, and retains events for 15 months. Server-side events are helpful for understanding
       causes of a funnel drop-off which are external to the client-side (for example, payment processing error).
-      See the [Product Analytics page](https://docs.datadoghq.com/product_analytics/) for more information.
+
+      **Note**: Sending server-side events impacts billing. Review the [pricing page](https://www.datadoghq.com/pricing/?product=product-analytics#products)
+      and contact your Customer Success Manager for more information.
     name: Product Analytics
   - description: |-
       Manage your Real User Monitoring (RUM) applications, and search or aggregate your RUM events over HTTP. See the [RUM & Session Replay page](https://docs.datadoghq.com/real_user_monitoring/) for more information

features/v2/product_analytics.feature

@@ -4,8 +4,10 @@ Feature: Product Analytics
   allows you to collect custom events from any server-side source, and
   retains events for 15 months. Server-side events are helpful for
   understanding causes of a funnel drop-off which are external to the
-  client-side (for example, payment processing error). See the [Product
-  Analytics page](https://docs.datadoghq.com/product_analytics/) for more
+  client-side (for example, payment processing error).  **Note**: Sending
+  server-side events impacts billing. Review the [pricing
+  page](https://www.datadoghq.com/pricing/?product=product-
+  analytics#products) and contact your Customer Success Manager for more
   information.
 
   Background: