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 18.61%. Comparing base (bf92f55) to head (7986040).

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #6150       +/-   ##
===========================================
- Coverage   81.68%   18.61%   -63.07%     
===========================================
  Files         170      170               
  Lines       64119    64119               
===========================================
- Hits        52376    11937    -40439     
- Misses      11743    52182    +40439     

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