Listing aliases for a (sub) command

### Description

In the CLI I'm building, I have a "list" sub-command with an alias "ls" defined. So something like:

```sh
$ cli repo list
$ cli repo ls
```

However, when I look at the generated help for the list command, I don't see any aliases displayed. It would be nice to have an ALIASES section in the help output.

Start at the generated help output for a sub-command and trace the help-generation path for the command's defined aliases. Use the example `list`/`ls` command to verify the behavior, then confirm that the help for `list` includes an ALIASES section listing `ls`.

Written by the indexing model from the issue text.