[웹소켓] 번역 - line271 (#1606)

Author: TGBegins

5-network/11-websocket/article.md

@@ -268,7 +268,7 @@ To get connection state, additionally there's `socket.readyState` property with
 - **`0`** -- "CONNECTING": the connection has not yet been established,
 - **`1`** -- "OPEN": 연결이 성립되고 통신 중
 - **`2`** -- "CLOSING": the connection is closing,
-- **`3`** -- "CLOSED": the connection is closed.
+- **`3`** -- "CLOSED": 커넥션이 종료됨
 
 
 ## Chat example