proxy: fix typos in comments

Change-Id: I7091af7efe71d46a0f55fd8341afcaa76073adaf
Reviewed-on: https://go-review.googlesource.com/71630
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

proxy/per_host.go

@@ -61,7 +61,7 @@ func (p *PerHost) dialerForRequest(host string) Dialer {
 			return p.bypass
 		}
 		if host == zone[1:] {
-			// For a zone "example.com", we match "example.com"
+			// For a zone ".example.com", we match "example.com"
 			// too.
 			return p.bypass
 		}

proxy/socks5.go

@@ -12,7 +12,7 @@ import (
 )
 
 // SOCKS5 returns a Dialer that makes SOCKSv5 connections to the given address
-// with an optional username and password. See RFC 1928 and 1929.
+// with an optional username and password. See RFC 1928 and RFC 1929.
 func SOCKS5(network, addr string, auth *Auth, forward Dialer) (Dialer, error) {
 	s := &socks5{
 		network: network,
@@ -60,7 +60,7 @@ var socks5Errors = []string{
 	"address type not supported",
 }
 
-// Dial connects to the address addr on the network net via the SOCKS5 proxy.
+// Dial connects to the address addr on the given network via the SOCKS5 proxy.
 func (s *socks5) Dial(network, addr string) (net.Conn, error) {
 	switch network {
 	case "tcp", "tcp6", "tcp4":