wgengine/magicsock: remove mention of Start
The Start method was removed in but the comment on NewConn
still mentioned it doesn't do anything until this method is called.
@@ -538,8 +538,6 @@ func newConn() *Conn {
// NewConn creates a magic Conn listening on opts.Port.
// As the set of possible endpoints for a Conn changes, the
// callback opts.EndpointsFunc is called.
-//
-// It doesn't start doing anything until Start is called.
func NewConn(opts Options) (*Conn, error) {
c := newConn()
c.port.Store(uint32(opts.Port))
