Improve docs wording and simplify test.

Author: cobward

src/lib.rs

@@ -1878,11 +1878,8 @@ mod tests {
     #[tokio::test]
     async fn test_pubsub_send_and_receive() {
         let alice = Node::new("alice").await;
-        let alice_addr: Multiaddr = "/ip4/127.0.0.1/tcp/10001".parse().unwrap();
-        alice.add_listening_address(alice_addr).await.unwrap();
         let bob = Node::new("bob").await;
-        let bob_addr: Multiaddr = "/ip4/127.0.0.1/tcp/10002".parse().unwrap();
-        bob.add_listening_address(bob_addr.clone()).await.unwrap();
+        let bob_addr = bob.addrs_local().await.unwrap()[0].clone();
 
         let topic = String::from("test_topic");
         alice