docs(contributing): fix incorrect vector iteration and simplify quick_sort example#3071

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Commits on Dec 5, 2025

Fixed overcomplicated quick_sort test range in CONTRIBUTING.md
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Replace incorrect sizeof-based loop with arr.size() in CONTRIBUTING.md example
Aditya-354
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Replace incorrect sizeof-based loop with modern range-based loop in CONTRIBUTING.md example
Aditya-354
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