🔌 Superconducting tf power coversion docs

[chris-ashe]

Description

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 14.89362% with 40 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.05%. Comparing base (cc15436) to head (e9db0f0).

Files with missing lines	Patch %	Lines
process/power.py	2.70%	36 Missing ⚠️
process/tf_coil.py	0.00%	2 Missing ⚠️
process/resistive_tf_coil.py	0.00%	1 Missing ⚠️
process/superconducting_tf_coil.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3721      +/-   ##
==========================================
+ Coverage   46.03%   46.05%   +0.02%     
==========================================
  Files         123      123              
  Lines       28970    28966       -4     
==========================================
+ Hits        13335    13340       +5     
+ Misses      15635    15626       -9     

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