Fix comments about header dependencies

[darbyjohnston]

Summarize your change.

This change just updates the comments in CMakeLists.txt about the header dependencies.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.75%. Comparing base (c0e97b0) to head (39dcbe7).
Report is 34 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1826      +/-   ##
==========================================
+ Coverage   84.11%   84.75%   +0.63%     
==========================================
  Files         198      176      -22     
  Lines       22241    12711    -9530     
  Branches     4687     1181    -3506     
==========================================
- Hits        18709    10773    -7936     
+ Misses       2610     1760     -850     
+ Partials      922      178     -744     

Flag	Coverage Δ
py-unittests	84.75% <ø> (+0.63%)	⬆️

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see 129 files with indirect coverage changes

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