Unleash GO SDK Version in docs site

[xico42]

In the unleash documentation site regarding the golang SDK it recommends installing the version 3 of the sdk, even though the v4 was released in november of 2023.

go get github.com/Unleash/unleash-client-go/v3

Is this intended?

[gastonfournier]

Hi @xico42! I think it was just an overlook when we released the new version. This PR should fix it: #8857 once merged