update https://tip.golang.org/doc/code.html to remove references to GOPATH

[amnonbc]

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

$ go version

tip

Does this issue reproduce with the latest release?

yes

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

na

go env Output

$ go env

What did you do?

nothing

What did you expect to see?

module compliant guidelines for code layout

What did you see instead?

old GOPATH style layout

[agnivade]

Hello @amnonbc, this is a duplicate of #28215. And it looks like you have already commented there in the past. I am going to close this in favor of that.

[amnonbc]

👍
sorry, I forgot #28215