net: fix typo
LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/128500043
diff --git a/src/pkg/net/sockopt_bsd.go b/src/pkg/net/sockopt_bsd.go
index 77d51d7..2d36a55 100644
--- a/src/pkg/net/sockopt_bsd.go
+++ b/src/pkg/net/sockopt_bsd.go
@@ -17,7 +17,7 @@
// On DragonFly BSD, we adjust the ephemeral port
// range because unlike other BSD systems its default
// port range doesn't conform to IANA recommendation
- // as described in RFC 6355 and is pretty narrow.
+ // as described in RFC 6056 and is pretty narrow.
switch family {
case syscall.AF_INET:
syscall.SetsockoptInt(s, syscall.IPPROTO_IP, syscall.IP_PORTRANGE, syscall.IP_PORTRANGE_HIGH)
