Improve comment

ringpop.go

@@ -189,10 +189,11 @@ func (rp *Ringpop) identity() (string, error) {
 // TChannel object on the Ringpop instance.
 func (rp *Ringpop) channelIdentityResolver() (string, error) {
 	peerInfo := rp.channel.PeerInfo()
-	// Check that TChannel is listening. By default, TChannel listens on an
-	// ephemeral host/port. The real port is then assigned by the OS when
-	// ListenAndServe is called. If the hostport is 0.0.0.0:0, it means
-	// TChannel is not yet listening and the hostport cannot be resolved.
+	// Check that TChannel is listening on a real hostport. By default,
+	// TChannel listens on an ephemeral host/port. The real port is then
+	// assigned by the OS when ListenAndServe is called. If the hostport is
+	// ephemeral, it means TChannel is not yet listening and the hostport
+	// cannot be resolved.
 	if peerInfo.IsEphemeralHostPort() {
 		return "", ErrEphemeralIdentity
 	}