bug: Nushell completions

[kuchta]

Describe the Bug

It seems like documentation for nushell completions is outdated, since . "$asdf_data_dir/completions/nushell.nu" returns error because source should be used instead of . and the path should be in the form ($env.ASDF_DATA_DIR)/completions/asdf.nu

. "$asdf_data_dir/completions/nushell.nu"
Error: nu::shell::external_command

  × External command failed
   ╭─[entry #35:1:1]
 1 │ . "$asdf_data_dir/completions/nushell.nu"
   · ┬
   · ╰── Command `.` not found
   ╰────
  help: `.` is neither a Nushell built-in or a known external command

Steps to Reproduce

N/A

Expected Behaviour

N/A

Actual Behaviour

N/A

Environment

N/A

asdf plugins affected (if relevant)

No response

[Stratus3D]

Pull request welcome! Nushell isn't a shell I stay up to date on.

[Stratus3D]

Closing as I think this will be fixed by #2275.