x/website: command wrong on website tutorial need retire the '=' after -replace

[denpufa]

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

$ go version

Does this issue reproduce with the latest release?

Yes,

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

It's not a problem with Go code.

go env Output

$ go env

What did you do?

I use the command

$ go mod edit -replace=example.com/greetings=../greetings

What did you expect to see?

nothing on prompt command after runing the comand

What did you see instead?

go mod: -replace=example: need old[@v]=new[@w] (missing =)

[seankhliao]

Duplicate of #44924