DOCS: Add docstring to some classes in constants.py

[Devin-Crawford]

Update documentation for AXIS and a few other
constant CLASSES.

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Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.66%. Comparing base (5fc28b4) to head (352ef5f).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6099   +/-   ##
=======================================
  Coverage   85.65%   85.66%           
=======================================
  Files         166      166           
  Lines       62786    62786           
=======================================
+ Hits        53781    53787    +6     
+ Misses       9005     8999    -6     

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[SMoraisAnsys]

Just an open question, could we use pyrhon enums here instead of this custom enum ?

[Devin-Crawford]

Just an open question, could we use pyrhon enums here instead of this custom enum ?

I defer to the experts on this question.