Update release notes for Azure Arc: add September 15, 2025 extension version and remove outdated September 2024 and August 2024 entries.

Author: MikeRayMSFT

docs/sql-server/azure-arc/release-notes.md

@@ -25,6 +25,10 @@ Extension versions are cumulative. Higher extension versions include all of the
 
 Only Azure extension for SQL Server agent versions released within the last year are supported.
 
+## September 15, 2025
+
+**Extension version**: `1.1.3176.319`
+
 ## August
 
 **Extension version**: `1.1.3139.313`
@@ -158,22 +162,6 @@ Inventory additional service resources in portal (preview):
 
 ESU sets the bill-back date to the beginning of the current ESU year based on the timestamp when ESU was enabled, or p-core ESU license was activated. For details, review [SQL Server Extended Security Updates enabled by Azure Arc](extended-security-updates.md).
 
-## September 2024
-
-**Extension version**: `1.1.2803.208`
-
-### Availability group inventory
-
-Availability group (AG) inventory feature for all license types is now released for general availability. For complete description of feature, see [Manage Always On availability groups](manage-availability-group.md).
-
-### Apply physical core license to physical machines
-
-Apply physical core license types to physical core machines - general availability.
-
-## August 2024
-
-**Extension version**: `1.1.2769.203`
-
 ### Security improvements
 
 Various security improvements for SQL Server enabled by Azure Arc.