Improve epoll content with many resource.

src/data/roadmaps/server-side-game-developer/content/epoll@qaWv4gxnnj3uX8lEm9KQ4.md

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+# epoll  
+
+**epoll** is a high-performance I/O event notification system in Linux, essential for handling 
+large-scale asynchronous network operations in server-side game development. Unlike `select` 
+or `poll`, it uses an event-driven model, reducing CPU overhead and improving scalability. 
+Game servers leverage epoll to efficiently manage thousands of concurrent connections, 
+responding only when events occur, minimizing system calls, and optimizing resource 
+usage—making it ideal for multiplayer games and real-time applications.
+
+Visit the following resources to learn more:
+
+- [@documentation@Linux epoll API](https://man7.org/linux/man-pages/man7/epoll.7.html)  
+- [@article@Understanding epoll for Scalable Network Servers](https://medium.com/@copyconstruct/the-method-to-epolls-madness-d9d2d6378642)
+- [@article@epoll vs select vs poll](https://devarea.com/linux-io-multiplexing-select-vs-poll-vs-epoll/)