Update poly coeff ordering comment

[andrewmilson]

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[reviewable-StarkWare]

This change is 

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.82%. Comparing base (e256346) to head (3dec637).
Report is 2 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1026      +/-   ##
==========================================
- Coverage   92.82%   92.82%   -0.01%     
==========================================
  Files         105      105              
  Lines       14263    14299      +36     
  Branches    14263    14299      +36     
==========================================
+ Hits        13240    13273      +33     
- Misses        943      946       +3     
  Partials       80       80              

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