Have autocomplete insert argument hints

E.g. for the [FROM](https://docs.docker.com/engine/reference/builder/#from) command the following options should be shown:
```
FROM [--platform=<platform>] <image> [AS <name>]
FROM [--platform=<platform>] <image>[:<tag>] [AS <name>]
FROM [--platform=<platform>] <image>[@<digest>] [AS <name>]
```