DOCS: improving documentation of Maxwell class

[anur7]

Description

Adding examples and improving docstring of Maxwell's methods.

Issue linked

#6136

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).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

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[Samuelopez-ansys]

@anur7 Please could you be more specific in the PR Title? It is important because if you are going to change only one method, then I would change the title to "Improve xxxx method documentation"

And then please add some description.

Thank you!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.39%. Comparing base (6d6d39f) to head (8e2eca8).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6150   +/-   ##
=======================================
  Coverage   85.39%   85.39%           
=======================================
  Files         175      175           
  Lines       66157    66157           
=======================================
+ Hits        56492    56498    +6     
+ Misses       9665     9659    -6     

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[gmalinve]

@anur7 @nunesanderson I trust all examples are running smoothly as I didnìt have time to test them all. I also trust that all sentences "it works only in..." a specific solver are also correct as I didn't check upon every of them.

[nunesanderson]

@gmalinve I think this PR is ready to be merged. The example with harmonic force is working properly.
Would you mind checking whether Abdun can merge?
There seems to be an issue with the codecov.
Thank you!
@anur7