chore: fix typos in src/main/java/com/thealgorithms/datastructures/graphs/MatrixGraphs.java

[khanhkhanhlele]

This PR fixes typos in the file src/main/java/com/thealgorithms/datastructures/graphs/MatrixGraphs.java.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.32%. Comparing base (dd01b35) to head (fde7a3d).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #7026   +/-   ##
=========================================
  Coverage     78.32%   78.32%           
  Complexity     6651     6651           
=========================================
  Files           750      750           
  Lines         22143    22143           
  Branches       4350     4350           
=========================================
  Hits          17344    17344           
  Misses         4101     4101           
  Partials        698      698           

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