Some documentation refactoring. No code changes. (0.39.12)

docs/examples/net/http_mt_server.md

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+# http_mt_server.fun
+
+- Location: examples/net/http_mt_server.fun
+- Category: Networking / HTTP (multi-threaded)
+
+Description
+- Thread-per-connection HTTP server built on io/socket.fun and io/thread.fun. For each accepted client, spawns a thread and returns a small HTML page.
+
+How to run
+- From the repository root:
+  - export FUN_LIB_DIR="./lib"
+  - ./build_debug/fun examples/net/http_mt_server.fun
+  - Then open http://127.0.0.1:8080/ (or the port printed on start)
+
+Requirements
+- Uses stdlib io/socket.fun and io/thread.fun. No external extensions required.
+
+See also
+- docs/examples/README.md
+- docs/examples/httpserver.md (deep-dive)