New review comment by endigma on void-packages repository

https://github.com/void-linux/void-packages/pull/29326#discussion_r592900471

Comment:
ahesford: you suggest a restructure of the package to be as follows correct?:

```
docker-cli
 -> docker (transitional package)
moby (docker-engine)
```

this isn't a horrible idea, but I think my approach is better for a few reasons:
1. the docker-cli doesn't depend on the docker container daemon, nor vice versa
2. some people may wish to install one of the two packages individually
3. as it stands, `docker` is a dummy package similar to `xorg` which provides all the tools one might expect or need.
4. renaming the engine package to moby may be more accurate to the repository used, however if someone queries the xbps repositories for docker related packages it might be better to name the package in relation to what it's normally used for. 

I noted in another thread that I'd update the upstream for `docker-engine` to be `docker/engine` however it seems for some reason the `20.10` release is not tagged, so I'll revert to the moby upstream. A good remedy for this might be making `docker-engine` a transitional package for `moby`?

I'd love more input on how to improve things, and I've left responses on your suggested edits.