Update calculation.js: docs update

[gulshan-123]

Resolves #7155

Changes:

Added clarification that the map function does linear mapping

Screenshots of the change:

PR Checklist

• npm run lint passes
• Inline reference is included / updated
• Unit tests are included / updated

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[gulshan-123]

@all-contributors please add @gulshan-123 for doc

[allcontributors]

@gulshan-123

I've put up a pull request to add @gulshan-123! 🎉

[ksen0]

Hi @gulshan-123 thanks for your effort here, but please note that this is not the recommended usage of the all-contributors bot, and please review the contributor guidelines for future reference, specifically:

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