docs: correct markdown on github actions tutorial page

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[codecov]

Codecov Report

Merging #277 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #277      +/-   ##
==========================================
- Coverage   96.63%   96.62%   -0.01%     
==========================================
  Files          33       33              
  Lines         921      919       -2     
==========================================
- Hits          890      888       -2     
  Misses         31       31              

Flag	Coverage Δ
#unittests	96.62% <100.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
commitizen/__version__.py	100.00% <100.00%> (ø)
commitizen/git.py	95.50% <0.00%> (-0.05%)	⬇️
commitizen/cz/base.py	100.00% <0.00%> (ø)

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