Data acceleration report docs: use the versions and 404 behavior the REST API docs and a live check support

Co-Authored-By: Claude Code <noreply@anthropic.com>

Author: jacalata

docs/api-ref.md

@@ -1238,9 +1238,9 @@ REST API: [Get Data Acceleration Report for a Site](https://help.tableau.com/cur
 
 **Version**
 
-Introduced in Tableau Server 2020.2 (REST API 3.8). Tableau deprecated data acceleration in Tableau Server 2022.1, when view acceleration was introduced, and retired it in Tableau Server 2026.2 (REST API 3.29). It was never available on Tableau Cloud.
+Introduced in Tableau Server 2020.2 (REST API 3.8). The REST API documentation lists data acceleration as supported from Tableau Server 2020.2 (REST API 3.8) through Tableau Server 2021.4 (REST API 3.15). Tableau retired data acceleration and its REST API methods in Tableau Server 2026.2 (REST API 3.29). The method is not available on Tableau Cloud.
 
-Tableau Cloud responds to this request with a 404 (Resource Not Found). The method is not supported on Tableau Server 2026.2 and later. TSC has no replacement for this method; view acceleration was retired at the same time.
+Tableau Cloud and Tableau Server 2026.2 and later respond to this request with a 404 (error code 404003, Resource Not Found). This was observed on Tableau Cloud with REST API 3.30 and on Tableau Server with REST API 3.31. TSC has no replacement for this method; Tableau retired view acceleration at the same time.
 
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