shell command is missing from help

[carlotm]

Required information

• Distribution: Arch Linux

Issue description

the command shell should be included in the help output, under the Available Commands section

Steps to reproduce

1. Run incus help

[stgraber]

That's because it's not an actual command, instead it's a built-in alias.
That's why incus shell --help for example shows you the incus exec help message.

[stgraber]

That's also why you'll never see us refer to incus shell in our documentation. All examples use incus exec directly.

[stgraber]

One issue is that those built-in aliases don't show up in incus alias list so I'll be fixing that.

[carlotm]

Gotcha, thank you!