docs: remove empty example link (#32439)

https://github.com/vercel/next.js/tree/canary/examples/custom-server This example has been moved to the documentation ## Documentation / Examples - [x] Make sure the linting passes by running `yarn lint`
vercel · Dec 13, 2021 · d665794 · d665794
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diff --git a/docs/advanced-features/custom-server.md b/docs/advanced-features/custom-server.md
@@ -7,7 +7,6 @@ description: Start a Next.js app programmatically using a custom server.
 <details>
   <summary><b>Examples</b></summary>
   <ul>
-    <li><a href="https://github.com/vercel/next.js/tree/canary/examples/custom-server">Basic custom server</a></li>
     <li><a href="https://github.com/vercel/next.js/tree/canary/examples/custom-server-express">Express integration</a></li>
     <li><a href="https://github.com/vercel/next.js/tree/canary/examples/custom-server-hapi">Hapi integration</a></li>
     <li><a href="https://github.com/vercel/next.js/tree/canary/examples/custom-server-koa">Koa integration</a></li>