Improve select content with many resource.

src/data/roadmaps/server-side-game-developer/content/select@5-5toy2CblZPCV9d5QPEo.md

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+# select  
+
+**select** is a multiplexing system call in Linux used for monitoring multiple file descriptors
+to check if they are ready for I/O operations. It is commonly used in server-side game 
+development for handling multiple connections asynchronously. However, `select` has 
+limitations, as it scans all file descriptors linearly, making it inefficient for handling 
+a large number of concurrent connections. Despite its drawbacks, it remains useful for 
+simpler applications or legacy systems. Modern alternatives like `epoll` or `kqueue` offer 
+better performance and scalability.  
+
+Resources:  
+- [@documentation@Linux select API](https://man7.org/linux/man-pages/man2/select.2.html)
+- [@article@select vs epoll vs poll](https://devarea.com/linux-io-multiplexing-select-vs-poll-vs-epoll/)