update go domain name

golang.org -> go.dev

Kubernetes-commit: c2bd0a5fc081c97dcafc37571e51663b690d32f3

Author: LJTian

README.md

@@ -19,7 +19,7 @@ cli client. That client will eventually move here too.
 
 - No dependence on `k8s.io/kubernetes`. Dependence on other repositories is fine.
 
-- Code must be usefully [commented](https://golang.org/doc/effective_go.html#commentary).
+- Code must be usefully [commented](https://go.dev/doc/effective_go#commentary).
   Not only for developers on the project, but also for external users of these packages.
 
 - When reviewing PRs, you are encouraged to use Golang's [code review