docs: add edge cases to BinarySearch documentationClean binary search doc

[prashantpiyush1111]

Added an Edge Cases section to the BinarySearch JavaDoc to improve clarity for beginners.

This includes handling of:

• null and empty arrays
• null keys
• element not found cases
• single element arrays
• duplicate elementsAdded an Edge Cases section to the BinarySearch JavaDoc to improve clarity for beginners.

This includes handling of:

• null and empty arrays
• null keys
• element not found cases
• single element arrays
• duplicate elements

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.56%. Comparing base (b3e31b5) to head (b9c25a8).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7384      +/-   ##
============================================
+ Coverage     79.53%   79.56%   +0.02%     
- Complexity     7176     7184       +8     
============================================
  Files           798      799       +1     
  Lines         23467    23484      +17     
  Branches       4617     4617              
============================================
+ Hits          18665    18684      +19     
+ Misses         4055     4054       -1     
+ Partials        747      746       -1     

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