docs: update build guideline (#2434)

Co-authored-by: Himself65 <himself65@outlook.com>

apps/web/README.md

@@ -10,7 +10,7 @@ First, run the development server:
 pnpm run dev
 ```
 
-Open [http://localhost:8080](http://localhost:3000) with your browser to see the result.
+Open [http://localhost:8080](http://localhost:8080) with your browser to see the result.
 
 You can start editing the page by modifying `src/pages/workspace/[workspaceId]/all.tsx`. The page auto-updates as you edit the file.