3.25.0-preview: Adds missing changelog (#3133)

The 3.25.0-preview release missed the partition key delete in the changelog. The contract file shows the change. This is just fixing the changelog.

Author: j82w

changelog.md

@@ -34,6 +34,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - [#3049](https://github.com/Azure/azure-cosmos-dotnet-v3/pull/3049) ClientEncryption: Adds algorithm to EncryptionKeyWrapMetadata
 
 ### <a name="3.25.0-preview"/> [3.25.0-preview](https://www.nuget.org/packages/Microsoft.Azure.Cosmos/3.25.0-preview) - 2022-02-18
+
+#### Added
+- [#2948](https://github.com/Azure/azure-cosmos-dotnet-v3/pull/2948) Partition Key Delete: Adds DeleteAllItemsByPartitionKeyStreamAsync to container
+
 ### <a name="3.25.0"/> [3.25.0](https://www.nuget.org/packages/Microsoft.Azure.Cosmos/3.25.0) - 2022-02-18
 
 #### Added