doc: update benchmark result (#4354)

update brief benchmark report

Signed-off-by: shawnh2 <shawnhxh@outlook.com>
Co-authored-by: Xunzhuo <bitliu@tencent.com>

site/content/en/contributions/DEVELOP.md

@@ -163,7 +163,7 @@ the detailed benchmark report, namely `benchmark_report.zip`.
 
 Here are some brief benchmark reports about Envoy Gateway: 
 
-- It will take up nearly 1.3GiB memory and 11s total CPU time for (1 GatewayClass + 1 Gateway + 500 HTTRoutes) settings
+- It will take up nearly 550MiB memory and 11s total CPU time for (1 GatewayClass + 1 Gateway + 500 HTTRoutes) settings
 
 
 [Quickstart]: https://github.com/envoyproxy/gateway/blob/main/docs/latest/user/quickstart.md