Improve comments, function & class documentation in IndexOfRightMostSetBit.java

[Hardvan]

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• 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 ✅

Project coverage is 55.40%. Comparing base (dea806e) to head (84a0e47).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5579   +/-   ##
=========================================
  Coverage     55.40%   55.40%           
  Complexity     3490     3490           
=========================================
  Files           539      539           
  Lines         15607    15607           
  Branches       2965     2965           
=========================================
  Hits           8647     8647           
  Misses         6600     6600           
  Partials        360      360           

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[siriak]

Looks good, thanks!

[Hardvan]

Thanks!