Update docstring of command type

[Miauwkeru]

Noticed from #220 that the docstring of the command type didn't
represent the correct output anymore since we now also split the windows
arguments.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.24%. Comparing base (5093cf6) to head (82a5491).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #224   +/-   ##
=======================================
  Coverage   84.24%   84.24%           
=======================================
  Files          35       35           
  Lines        3746     3746           
=======================================
  Hits         3156     3156           
  Misses        590      590           

Flag	Coverage Δ
unittests	84.24% <ø> (ø)

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[yunzheng]

Actually the code block doesn't really make sense to me. The old one didn't really either now that I look back at it.

'c:\\windows\\malware.exe /info'                      ->   windows_path('c:\\windows\\malware.exe) ('/info',)
'/usr/bin/env bash'                                   ->   posix_path('/usr/bin/env') ('bash',)

# In this situation, the executable path needs to be quoted.
'c:\\user\\John Doe\\malware.exe /all /the /things'   ->   windows_path('c:\\user\\John')                                                                  ('Doe\\malware.exe, '/all', '/the', /things')

wouldn't it be better to show how it works with a inline doctest?