docs: update changelog for grpc execution transport

Author: tac0turtle

CHANGELOG.md

@@ -12,6 +12,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changes
 
 - Optimization of mutex usage in cache for reaper [#3286](https://github.com/evstack/ev-node/pull/3286)
+- Add Unix domain socket support for gRPC execution endpoints via `unix:///path/to/socket`.
+- Add additive `tx_batch` fields for gRPC execution transaction payloads so Go clients and servers can use contiguous transaction buffers while retaining legacy `txs` compatibility.
 
 ## v1.1.1