Basic e mag example review

[JackB-Ansys]

Updates to EMag basic example. Fixes some issues and enhancements made to comments. Now the harmonic amplitude graph is plotted instead of the torque being plotted twice.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.59%. Comparing base (d9471c8) to head (5e14e34).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #322      +/-   ##
==========================================
- Coverage   88.66%   88.59%   -0.07%     
==========================================
  Files          21       21              
  Lines        2487     2491       +4     
==========================================
+ Hits         2205     2207       +2     
- Misses        282      284       +2     

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[james-packer]

Looks good. A couple of comments about the pictures.