Remaining missing docstrings

[clmould]

Description

Add remaining missing docstrings

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.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 49.14%. Comparing base (6a9a047) to head (0bd668f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
process/models/tfcoil/superconducting.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4512      +/-   ##
==========================================
- Coverage   49.14%   49.14%   -0.01%     
==========================================
  Files         152      152              
  Lines       29814    29812       -2     
==========================================
- Hits        14652    14651       -1     
+ Misses      15162    15161       -1     

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