doc: missing documentation of quoting the URL of url.Errors in go1.14 release notes

[fraenky8]

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

$ go version
go version go1.14 darwin/amd64

Does this issue reproduce with the latest release?

Yes.

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

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/fraenky8/Library/Caches/go-build"
GOENV="/Users/fraenky8/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOOS="darwin"
GOPATH="/Users/fraenky8/Coding/Go"
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/Cellar/go/1.14/libexec"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.14/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/8v/jgh2dzcn62n0lfyws13mc_rw0000gp/T/go-build103321297=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

Print a url.Error:

err := &url.Error{
	Op:  "Get",
	URL: "http://localhost/test/path",
	Err: errors.New("EOF"),
}

fmt.Printf("something went wrong: %v", err)

What did you expect to see?

something went wrong: Get http://localhost/test/path: EOF

What did you see instead?

something went wrong: Get "http://localhost/test/path": EOF

The URL is now quoted.

This originates from PR #29384 and is mentioned here: stellar/go#2325 (comment)

The documentation in the release notes of go1.14 is missing for this change.

[ianlancetaylor]

See #29261 and https://golang.org/cl/185117.

CC @stefanb @mvdan @dsnet

We even considered reverting the change (in https://golang.org/cl/195978), but we still forgot to add a release note. Sigh.

[dmitshur]

This needs to be fixed on master branch first, then it can be backported to Go 1.14.x. I've changed the milestone of this issue to 1.15, and will open a backport issue for 1.14.x.

@gopherbot Please open a backport issue for Go 1.14; this is a documentation fix.

[gopherbot]

Backport issue(s) opened: #37630 (for 1.14).

Remember to create the cherry-pick CL(s) as soon as the patch is submitted to master, according to https://golang.org/wiki/MinorReleases.

[gopherbot]

Change https://golang.org/cl/222037 mentions this issue: doc/go1.14: document that unparsable URL in net/url/Error is now quoted