Updated descriptions for coolingwaterbodycoeffs dataclass

[grmtrkngtn]

Description

Adds descriptions to variables in water cooling data class.

Checklist

I confirm that I have completed the following checks:

• My changes follow the PROCESS style guide
• I have justified any large differences in the regression tests caused by this pull request in the comments.
• I have added new tests where appropriate for the changes I have made.
• If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• If I have made documentation changes, I have checked they render correctly.
• I have added documentation for my change, if appropriate.

[je-cook]

Thanks!

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.34%. Comparing base (c0ae5b2) to head (1581206).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4541      +/-   ##
==========================================
+ Coverage   49.32%   49.34%   +0.01%     
==========================================
  Files         150      150              
  Lines       29802    29813      +11     
==========================================
+ Hits        14700    14711      +11     
  Misses      15102    15102              

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