Update CHANGELOG.md

Author: chohongm

CHANGELOG.md

@@ -17,7 +17,7 @@ use [sb.connect()](https://sendbird.com/docs/chat/v4/javascript/application/auth
 const user = await sb.connect(userId: userId); 
 ```
 ### **Added appStateToggleEnabled param**
-Added SendbirdChatParams.appStateToggleEnabled which can be used to optionally disable internal control of Websocket connection on document.visibilityState change
+Added `SendbirdChatParams.appStateToggleEnabled` which can be used to optionally disable internal control of Websocket connection on `document.visibilityState` change
 
 
 ### **Improvements**
@@ -402,4 +402,4 @@ Stay tuned for updates as we are rolling out more exciting features and see belo
 For the changelog between the beta release, please refer to [this page](https://github.com/sendbird/sendbird-chat-sdk-javascript/blob/main/CHANGELOG_V4_BETA.md)
 
 ### v3 Changelog
-Please refer to [this page](https://github.com/sendbird/SendBird-SDK-JavaScript/blob/master/CHANGELOG.md)
+Please refer to [this page](https://github.com/sendbird/SendBird-SDK-JavaScript/blob/master/CHANGELOG.md)