added release notes summary (#376)

docs/build-on-linea/linea-version/index.mdx

@@ -1,5 +1,5 @@
 ---
-title: Release notes
+title: Release Notes
 sidebar_position: 4
 ---
 
@@ -9,7 +9,7 @@ import L2MessageService from "!!raw-loader!/files/testnet/2023-06-13-release/L2M
 import TokenBridgeL1 from "!!raw-loader!/files/testnet/2023-06-13-release/TokenBridgeL1.abi";
 import TokenBridgeL2 from "!!raw-loader!/files/testnet/2023-06-13-release/TokenBridgeL2.abi";
 
-# Release notes
+# Release Notes
 
 Find out all you need to know about the latest Linea versions.
 
@@ -19,6 +19,31 @@ Find out all you need to know about the latest Linea versions.
 > | --- | --- | --- |
 > | Linea Goerli | [Alpha v0.2.3](#linea-alpha-v023-june-22-23) | June 22, 2023 |
 
+## Summary Release Notes (June - October)
+
+Performance Improvements
+
+Changes to the Genesis File:
+We made changes to the genesis file to enable block times to be reduced. This enhancement improves the overall performance and throughput of Linea. 
+
+Improved Gas Limit Estimation for Finalization on L1:
+We improved the gas limit estimation for finalization on L1. 
+
+Cost Efficiency
+
+
+Update to the L1 Message Service Contract:
+We updated the L1 message service contract to work with the merkle tree, reducing gas costs and further enhancing the cost-effectiveness of Linea.
+
+Addition of Fixed Cost to the Gas Price:
+We added a fixed cost to the gas price to cover infrastructure costs for system economic sustainability. This change ensures the long-term financial viability of Linea. 
+
+User Experience
+
+
+Smooth L2 Gas Price Estimation:
+We smoothed the L2 gas price estimation by using an L1 moving average. This update makes our gas price estimation more accurate and reliable. 
+
 ## Linea Alpha v0.2.3 (June 22, 2023)
 
 ### Summary