refactor: Enhance docs, add tests in `Intersection`

[Hardvan]

trafficstars

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized it.
• [x] All filenames are in PascalCase.
• [x] All functions and variable names follow Java naming conventions.
• [x] All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• [x] All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 71.16%. Comparing base (26f114c) to head (bb4f0ec).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5976      +/-   ##
============================================
+ Coverage     71.08%   71.16%   +0.07%     
- Complexity     4881     4890       +9     
============================================
  Files           650      650              
  Lines         17529    17529              
  Branches       3378     3378              
============================================
+ Hits          12461    12474      +13     
+ Misses         4598     4586      -12     
+ Partials        470      469       -1     

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.