core: stdcm: add comment to clarify earliest conflict operation

[eckter]

Follow up of #10126 after @bougue-pe's input.

The logic doesn't change, we just add a clarifying comment.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.93%. Comparing base (7582bdd) to head (eb47878).
Report is 378 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10153      +/-   ##
==========================================
- Coverage   79.95%   79.93%   -0.02%     
==========================================
  Files        1057     1057              
  Lines      106403   106403              
  Branches      726      726              
==========================================
- Hits        85077    85058      -19     
- Misses      21284    21303      +19     
  Partials       42       42              

Flag	Coverage Δ
editoast	73.91% <ø> (-0.07%)	⬇️
front	89.20% <ø> (ø)
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	87.00% <ø> (ø)

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[bougue-pe]

👍 Thanks !

[Khoyo]

I'm trusting you on this ^^"