net: update TDDO

The issue #8432 has been marked as an issue for golang.org/x/net.

Change-Id: Ia39abd99b685c820ea6169ee6505b16028e7e77f
Reviewed-on: https://go-review.googlesource.com/3836Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/net/net.go

@@ -38,9 +38,6 @@ The Listen function creates servers:
 */
 package net
 
-// TODO(rsc):
-//	support for raw ethernet sockets
-
 import (
 	"errors"
 	"io"