Fixed typo in http not found message

src/main.rs

@@ -34,7 +34,7 @@ fn main() {
 }
 
 fn fail(mut stream: TcpStream) {
-    let _ = write!(stream, "HTTP/1.1 404 Not Fonud\r\n\r\n");
+    let _ = write!(stream, "HTTP/1.1 404 Not Found\r\n\r\n");
     let _ = writeln!(stream, "Page not found!");
 }