Update Send Alerts API documentation to focus on HolmesGPT (#2068)

* docs(send-alerts-api): orient intro around Holmes AI RCA

Reframe the page so it leads with Holmes investigating sent alerts, and
drop the generic benefits list and timeline screenshot.

* docs(send-alerts-api): drop redundant SaaS-only note

The exporting docs section is already commercial-only, so the inline
banner doesn't add information.

* docs(send-alerts-api): use HolmesGPT consistently and soften triage claim

Address CodeRabbit nitpicks: standardize on "HolmesGPT" instead of
mixing it with "Holmes", and reframe "skip the manual triage step" as
"accelerate triage" to avoid over-promising.

---------

Co-authored-by: Claude <noreply@anthropic.com>

Author: aantn

docs/configuration/exporting/send-alerts-api.rst

@@ -1,24 +1,12 @@
 Send Alerts API
 ===============
 
-Why Send Your Alerts to Robusta?
----------------------------------
-
-Benefits include:
-
-* Persistent alert history on a filterable timeline
-* Centralized view of alerts from all your monitoring systems (multiple Prometheus instances, cloud services, custom tools)
-* AI investigation of alerts
-* Correlations between alerts and Kubernetes deploys
-* and more!
-
-.. image:: /images/robusta-ui-timeline.png
-   :alt: Prometheus Alert History
+Send alerts to Robusta to have HolmesGPT automatically run an AI-powered root cause analysis on each one. HolmesGPT investigates the alert against your live cluster state, logs, metrics, and connected data sources, then attaches its findings to help accelerate triage.
 
 Integration Methods
 -------------------
 
-There are two main ways to send alerts to Robusta:
+There are two main ways to send alerts to Robusta for HolmesGPT to investigate:
 
 1. **Pre-built Integrations**: Use our existing integrations for AlertManager, Nagios, SolarWinds, and other monitoring systems. See :doc:`Send Alerts <../index>`.
 
@@ -27,9 +15,6 @@ There are two main ways to send alerts to Robusta:
 Send Alerts API
 ---------------
 
-.. note::
-    This API is available with the Robusta SaaS platform and self-hosted commercial plans. It is not available in the open-source version.
-
 Use this endpoint to send alert data to Robusta. You can send up to 1000 alerts in a single request.
 
 .. _send-alerts-api: