net: update BUG sections for go1.12

To confirm this change with the go commaned, please run 'go doc net'
instead of 'go doc -all net'; the -all option surpresses BUG sections.

Change-Id: Iac7bc85fbef48e91d5ede16da0ce4a7ab8cae539
Reviewed-on: https://go-review.googlesource.com/c/157297
Run-TryBot: Mikio Hara <mikioh.public.networking@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/net/interface.go

@@ -13,8 +13,8 @@ import (
 // BUG(mikio): On JS and NaCl, methods and functions related to
 // Interface are not implemented.
 
-// BUG(mikio): On DragonFly BSD, NetBSD, OpenBSD, Plan 9 and Solaris,
-// the MulticastAddrs method of Interface is not implemented.
+// BUG(mikio): On AIX, DragonFly BSD, NetBSD, OpenBSD, Plan 9 and
+// Solaris, the MulticastAddrs method of Interface is not implemented.
 
 var (
 	errInvalidInterface         = errors.New("invalid network interface")

src/net/unixsock.go

@@ -12,8 +12,11 @@ import (
 	"time"
 )
 
-// BUG(mikio): On JS, NaCl, Plan 9 and Windows, methods and functions
-// related to UnixConn and UnixListener are not implemented.
+// BUG(mikio): On JS, NaCl and Plan 9, methods and functions related
+// to UnixConn and UnixListener are not implemented.
+
+// BUG(mikio): On Windows, methods and functions related to UnixConn
+// and UnixListener don't work for "unixgram" and "unixpacket".
 
 // UnixAddr represents the address of a Unix domain socket end point.
 type UnixAddr struct {