[Archery][Integration] Add more explanation how `--target-implementations` works

### Describe the enhancement requested

We can use `click.Command` https://click.palletsprojects.com/en/8.1.x/api/#click.Command for it.

See also: https://github.com/apache/arrow/pull/44099#discussion_r1763137056

### Component(s)

Developer Tools, Integration