cosmetic: remove outdated comment

The deadlock described for SendProtocolMsg (if it was going via the
actor) cannot occur since all sending of broadcasts and gossip by
LocalPeer is mediated by GossipSenders, the interaction with which is
non-blocking.

mesh/connection.go

@@ -116,11 +116,6 @@ func (conn *LocalConnection) Established() bool {
 	return conn.established
 }
 
-// Send directly, not via the Actor.  If it goes via the Actor we can
-// get a deadlock where LocalConnection is blocked talking to
-// LocalPeer and LocalPeer is blocked trying send a ProtocolMsg via
-// LocalConnection, and the channels are full in both directions so
-// nothing can proceed.
 func (conn *LocalConnection) SendProtocolMsg(m ProtocolMsg) {
 	if err := conn.sendProtocolMsg(m); err != nil {
 		conn.Shutdown(err)