docs: gcloud-node or gcloud

We switch back and forth between gcloud and gcloud-node to distinguish it from the CLI. When title says gcloud, the description should not say gcloud-node?

But there is nothing to do for
> What is the relationship between gcloud-node and the gcloud commandline tool?

Should I revert this change back?
:feelsgood:
I would also consider adding a link to the googleapis library here so they understand what we are talking about but it's not a deal-breaker.