doc: --gui -> -gui (both supported)

[mpyw]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.53%. Comparing base (ba96a17) to head (18ae84d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #89   +/-   ##
=======================================
  Coverage   91.53%   91.53%           
=======================================
  Files          96       96           
  Lines        5882     5882           
=======================================
  Hits         5384     5384           
  Misses        340      340           
  Partials      158      158           

Flag	Coverage Δ
e2e	65.32% <ø> (ø)
unittests	83.54% <ø> (ø)

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