Update GrahamScan.java

[bayramtturgutt]

improved the Javadoc comments, clarified some methods in the Point class, and corrected some text.

• 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

Attention: Patch coverage is 47.05882% with 9 lines in your changes missing coverage. Please review.

Project coverage is 41.81%. Comparing base (5fc2623) to head (88c3b27).

Files	Patch %	Lines
...in/java/com/thealgorithms/geometry/GrahamScan.java	47.05%	3 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5310   +/-   ##
=========================================
  Coverage     41.81%   41.81%           
- Complexity     2587     2588    +1     
=========================================
  Files           521      521           
  Lines         15505    15493   -12     
  Branches       2963     2958    -5     
=========================================
- Hits           6483     6478    -5     
+ Misses         8726     8721    -5     
+ Partials        296      294    -2     

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[alxkm]

Thank you for your contribution.