Fix incorrect panic message in example

Author: TheColdVoid

library/std/src/net/tcp.rs

@@ -405,7 +405,7 @@ impl TcpStream {
     /// use std::net::TcpStream;
     ///
     /// let stream = TcpStream::connect("127.0.0.1:8000")
-    ///                        .expect("couldn't bind to address");
+    ///                        .expect("Couldn't connect to the server...");
     /// let mut buf = [0; 10];
     /// let len = stream.peek(&mut buf).expect("peek failed");
     /// ```