Describe the bug

nix help shell tries to gaslight the user into thinking the subcommand doesn't exist:

$ nix help shell
error: Nix has no subcommand 'shell'
Try 'nix --help' for more information.

nix shell --help correctly opens the manual, which calls the command nix env shell, but which then uses nix shell in every single example. Given how often this shorter alias is used, I think it's reasonable to expect nix help shell to show the correct documentation.

Steps To Reproduce

Run nix help shell

Expected behavior

Documentation is shown.

Metadata

nix-env (Nix) 2.28.4

Additional context

Checklist

• checked latest Nix manual (source)
• checked open bug issues and pull requests for possible duplicates

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