fix docs check

Author: huozhi

docs/03-pages/02-api-reference/03-next-config-js/serverExternalPackages.mdx

@@ -71,7 +71,6 @@ Next.js includes a [short list of popular packages](https://github.com/vercel/ne
 - `ts-node`
 - `typescript`
 - `vscode-oniguruma`
-- `undici`
 - `webpack`
 - `websocket`
 - `zeromq`