explain libp2p changes

Signed-off-by: ozkanonur <work@onurozkan.dev>

mm2src/mm2_libp2p/src/atomicdex_behaviour.rs

@@ -828,13 +828,13 @@ fn build_dns_ws_transport(
 ) -> BoxedTransport<(PeerId, libp2p::core::muxing::StreamMuxerBox)> {
     use libp2p::websocket::tls as libp2p_tls;
 
-    let dns_tcp = libp2p::dns::TokioDnsConfig::custom(
+    let ws_tcp = libp2p::dns::TokioDnsConfig::custom(
         libp2p::tcp::TokioTcpConfig::new().nodelay(true),
         libp2p::dns::ResolverConfig::google(),
         Default::default(),
     )
     .unwrap();
-    let mut ws_dns_tcp = libp2p::websocket::WsConfig::new(dns_tcp);
+    let mut ws_dns_tcp = libp2p::websocket::WsConfig::new(ws_tcp);
 
     if let Some(certs) = wss_certs {
         let server_priv_key = libp2p_tls::PrivateKey::new(certs.server_priv_key.0.clone());
@@ -846,12 +846,15 @@ fn build_dns_ws_transport(
         ws_dns_tcp.set_tls_config(wss_config);
     }
 
+    // This is for preventing port reuse of dns/tcp instead of
+    // websocket ports.
     let dns_tcp = libp2p::dns::TokioDnsConfig::custom(
         libp2p::tcp::TokioTcpConfig::new().nodelay(true),
         libp2p::dns::ResolverConfig::google(),
         Default::default(),
     )
     .unwrap();
+
     let transport = dns_tcp.or_transport(ws_dns_tcp);
     upgrade_transport(transport, noise_keys)
 }