Refactor stage description for TCP server implementation and clarify HTTP context.

Author: rohitpaulk

stage_descriptions/base-01-at4.md

@@ -1,8 +1,6 @@
-In this stage, you'll create a TCP server that listens on port 4221.
-
-[TCP](https://www.cloudflare.com/en-ca/learning/ddos/glossary/tcp-ip/) is the underlying protocol used by HTTP servers.
-
+HTTP servers communicate over TCP, the protocol that powers most web traffic. In this stage, you’ll implement a TCP server that listens on port 4221, just like a real HTTP server.
 
+<!--
 ### Tests
 
 The tester will execute your program like this:
@@ -15,4 +13,5 @@ Then, the tester will try to connect to your server on port 4221. The connection
 
 ### Notes
 
-- To learn how HTTP works, you'll implement your server from scratch using TCP primitives instead of using {{language_name}}'s built-in HTTP libraries.
+- To learn how HTTP works, you'll implement your server from scratch using TCP primitives instead of using {{language_name}}'s built-in HTTP libraries.
+-->