doc/go: Update url for module documentation

## Building Go modules with `buildGoModule` {#ssec-language-go}

The function `buildGoModule` builds Go programs managed with Go modules. It builds [Go Modules](https://github.com/golang/go/wiki/Modules) through a two phase build:

The function `buildGoModule` builds Go programs managed with Go modules. It builds [Go Modules](https://go.dev/wiki/Modules) through a two phase build:

- An intermediate fetcher derivation called `goModules`. This derivation will be used to fetch all the dependencies of the Go module.

- A final derivation will use the output of the intermediate derivation to build the binaries and produce the final output.