Update API docs

[korya]

The PR tries to make the API docs in https://pkg.go.dev/github.com/PlanitarInc/slc more consistent:

• Update API to have consistent naming for arguments
  The rules are:
  • use s for slice argumnets
  • use e for element arguments
  • append index to argument names if there are multiple of them;
    e.g. s1/s2 or e1/e2
• Add missing math meaning for more functions: Overlap() and Intersect()

[coveralls]

Pull Request Test Coverage Report for Build 6656080881

• 70 of 70 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 6655348036:	0.0%
Covered Lines:	135
Relevant Lines:	135

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💛 - Coveralls

[gitstream-cm]

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[korya]

@orihab @flpsan Guys, do you have any objections?

[gitstream-cm]

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Review resolved

[gitstream-cm]

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[gitstream-cm]

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Review resolved