Update release-notes.md

Author: Juliako

articles/azure-video-indexer/release-notes.md

@@ -43,16 +43,16 @@ var uploadRequestResult = await client.PostAsync($"{apiUrl}/{accountInfo.Loc
 
 ## August 2022  release updates
 
-## Update topic inferencing model 
+### Update topic inferencing model 
 
 Azure Video Indexer topic inferencing model was updated and now we extract more than 6.5 million topics (for example, covering topics such as Covid virus). To benefit from recent model updates you need to re-index your video files. 
 
-## Topic inferencing model is now available on Azure Government 
+### Topic inferencing model is now available on Azure Government 
 
 You can now leverage topic inferencing model in your Azure Video Indexer paid account on [Azure Government](../azure-government/documentation-government-welcome.md) in Virginia and Arizona regions. With this release we completed the AI parity between Azure global and Azure Government. 
 To benefit from the model updates you need to re-index your video files. 
 
-## Session length is now 30 days in the Azure Video Indexer website
+### Session length is now 30 days in the Azure Video Indexer website
 
 The [Azure Video Indexer website](https://vi.microsoft.com) session length was extended to 30 days. You can preserve your session without having to re-login every 1 hour.