chore: fix typos in src/main/java/com/thealgorithms/dynamicprogramming/BoundaryFill.java

[khanhkhanhlele]

This PR fixes typos in the file src/main/java/com/thealgorithms/dynamicprogramming/BoundaryFill.java.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.33%. Comparing base (c7cb54e) to head (3ba8223).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #7049   +/-   ##
=========================================
  Coverage     78.32%   78.33%           
- Complexity     6655     6656    +1     
=========================================
  Files           751      751           
  Lines         22162    22162           
  Branches       4353     4353           
=========================================
+ Hits          17359    17361    +2     
+ Misses         4104     4103    -1     
+ Partials        699      698    -1     

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