Update GrahamScan.java (#5310)

* Update GrahamScan.java

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

* Minor adjustment to GrahamScan.java

* revised GrahamScan.java

* Update-2 GrahamScan.java

* clang format GrahamScan.java

* reverted GrahamScan.java

* minor updates.java

* minor updates

* Spc.java

* clang format

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Co-authored-by: Alex Klymenko <alexanderklmn@gmail.com>