docs(sharp-missing-in-production.mdx): update standalone command (vercel#56191)

Author: ImBIOS

errors/sharp-missing-in-production.mdx

@@ -34,7 +34,7 @@ pnpm add sharp
 bun add sharp
 ```
 
-Then, build your project with `next build`. Finally, restart the server with either `next start` for production mode or `node server.js` for standalone mode.
+Then, build your project with `next build`. Finally, restart the server with either `next start` for production mode or `node .next/standalone/server.js` for standalone mode.
 
 - If `sharp` is already installed but can't be resolved, set the `NEXT_SHARP_PATH` environment variable such as `export NEXT_SHARP_PATH=/tmp/node_modules/sharp`. Then, build your project with `next build`. Finally, restart the server with either `next start` for production mode or `node server.js` for standalone mode.