FAQ Outdated

There are a few issues about the FAQ that was last updated a couple of years ago.

https://github.com/googleapis/google-cloud-node/blob/master/docs/faq.md

## Issues

- GCE: What about every other product?
- Auth link broken.
- Lambda: Why do we talk about Lambda if we don't mention GCF.
- What is the Cloud Node Client? Is that the old name of the Google API Node Client?

## Expected

I would expect these docs to be more up-to-date and the links/text/product line to be more accurate.