docs: Add Javadoc to sorts/BubbleSort.java

[Born-as-Harsha]

Description:

I noticed that the existing Bubble Sort implementation was lacking structured documentation required by modern Java standards.

This PR addresses that by performing a code quality update to enhance maintainability and readability for future contributors.

Changes include:

• Added comprehensive Javadoc blocks to the BubbleSort class and its primary methods.
• Included @param and @author tags to properly document the method's inputs and source.

Checklist (MANDATORY FIX)

Please read and check all relevant boxes:

• I have read [CONTRIBUTING.md]...
• This pull request is all my own work—I have not plagiarized it.
• All functions and variable names follow Java naming conventions.

---

Ready for final review!

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.33%. Comparing base (dfd8d69) to head (3893290).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #7014   +/-   ##
=========================================
  Coverage     78.32%   78.33%           
  Complexity     6615     6615           
=========================================
  Files           746      746           
  Lines         22022    22022           
  Branches       4321     4321           
=========================================
+ Hits          17249    17251    +2     
+ Misses         4085     4084    -1     
+ Partials        688      687    -1     

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