Remove todo, improve comment

Dependencies

• [2] CT3VONTO Introduce PLANKMIN and work with the neverending rows
• [3] VSG6UWDY Can now build floors
• [4] MLUGR2LL Add default impl and some basic plank logic
• [5] ZJPL7VNQ Separate planks from main
• [*] 5TH3AA46 10 mm extra space

Change contents

• replacement in src/main.rs at line 55
  [3.787]→[4.3782:3867](∅→∅),[4.3782]→[4.3782:3867](∅→∅)
  − // TODO should also check if the plank is too short, then WARN or take a new
  [3.787]

  [2.578]
  + // Check if the plank is too short, then take a new one