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:
> Google Cloud API Client for Node.js
I called it Google Cloud APIs Client for Node.js.

Done.