DOCS: improving primitives maxwell circuit documentation

[anur7]

Description

Adding examples and improving docstring of Maxwell circuit: primitives_maxwell_circuit.py

Issue linked

Issue #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).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.33%. Comparing base (316ba11) to head (94e4798).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6489      +/-   ##
==========================================
+ Coverage   82.32%   82.33%   +0.01%     
==========================================
  Files         231      231              
  Lines       74209    74209              
==========================================
+ Hits        61091    61100       +9     
+ Misses      13118    13109       -9     

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