At the start of a release development cycle, the contents of `next` should be deleted
and replaced with those of `initial`. From the repo root:

    > cd doc
    > rm -r next/*
    > cp -r initial/* next

Then edit `next/1-intro.md` to refer to the next version.

To prepare the release notes for a release, run `golang.org/x/build/cmd/relnote generate`.

pkg net/http, method (*Request) CookiesNamed(string) []*Cookie #61472...

// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

TEXT errors(SB),$0
	MOV	$errors(SB), (X5)		// ERROR "address load must target register"
	MOV	$8(SP), (X5)			// ERROR "address load must target register"
	MOVB	$8(SP), X5			// ERROR "unsupported address load"
	MOVH	$8(SP), X5			// ERROR "unsupported address load"

Requirements may be added, updated, and removed with 'go get'.
The vendor directory may be updated with 'go mod vendor'.
A typical sequence might be:

    cd src  # or src/cmd
    go get golang.org/x/net@master
    go mod tidy
    go mod vendor

Use caution when passing '-u' to 'go get'. The '-u' flag updates
modules providing all transitively imported packages, not only
the module providing the target package.

pkg net/http, type Cookie struct, Quoted bool #46443...

pkg net, type DNSError struct, UnwrapErr error #63116

pkg net/http, func ParseCookie(string) ([]*Cookie, error) #66008

pkg net/http/httptest, func NewRequestWithContext(context.Context, string, string, io.Reader) *http.Request #59473...