504 info correction

Author: jaesoni

articles/application-gateway/http-response-codes.md

@@ -97,9 +97,9 @@ HTTP 502 errors can have several root causes, for example:
 
 For information about scenarios where 502 errors occur, and how to troubleshoot them, see [Troubleshoot Bad Gateway errors](application-gateway-troubleshooting-502.md).
 
-#### 504 – Request timeout
+#### 504 – Gateway timeout
 
-HTTP 504 errors are presented if a request is sent to application gateways using v2 sku, and the backend response time exceeds the time-out value associated to the listener's rule. This value is defined in the HTTP setting.
+HTTP 504 errors are presented if a request is sent to application gateways using v2 sku, and the backend response time exceeds the time-out value configured in the Backend Setting.
 
 ## Next steps