ci: fix "unexpected input 'command'" warning

[cakebaker]

This PR fixes the "Unexpected input(s) 'command', valid inputs are ['config', 'fix', 'globs', 'separator']" warnings from markdownlint-cli2-action.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3fff10b) 95.00% compared to head (7b392dd) 95.00%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #66   +/-   ##
=======================================
  Coverage   95.00%   95.00%           
=======================================
  Files           4        4           
  Lines         961      961           
=======================================
  Hits          913      913           
  Misses         48       48           

Flag	Coverage Δ
macos_latest	99.33% <ø> (ø)
ubuntu_latest	99.33% <ø> (ø)
windows_latest	94.51% <ø> (ø)

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