net: document that Dial/Listen with "ip4:tcp" or "ip6:tcp" fails on Windows

[ilyaigpetrov]

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

go version go1.9.2 windows/amd64

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

$ go env
set GOARCH=amd64
set GOBIN=
set GOEXE=.exe
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOOS=windows
set GOPATH=C:\Users\ilyaigpetrov\go
set GORACE=
set GOROOT=C:\Go
set GOTOOLDIR=C:\Go\pkg\tool\windows_amd64
set GCCGO=gccgo
set CC=gcc
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0
set CXX=g++
set CGO_ENABLED=1
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config

Windwos 10

What did you do?

net: Dial/Listen with "ip4:tcp" or "ip6:tcp" fails on Windows
I want this to be documented

What did you expect to see?

On page https://golang.org/pkg/net/ in section Bugs I want to see that Dial/Listen with "ip4:tcp" or "ip6:tcp" fails on Windows

What did you see instead?

This is not documented.

[gopherbot]

Change https://golang.org/cl/86575 mentions this issue: net: update documentation on IP transport for network parameter