Fix misleading "Defensive copy" benefit in copying-collections-immutably pattern

[Copilot]

The third whyModernWins point claimed List.copyOf() provides a "defensive copy" advantage over the old approach—but the old code already shows Collections.unmodifiableList(new ArrayList<>(original)), which is also a defensive copy. The claim was only valid against a simple Collections.unmodifiableList(input) wrapper, not the code actually shown.

Changes

• content/collections/copying-collections-immutably.yaml — Replace "Defensive copy" with "Any Collection": List.copyOf() accepts Collection<? extends E> directly, whereas Collections.unmodifiableList() requires a List—which is precisely why the old code needs the intermediate new ArrayList<>() step.
• 12 translation files (ar, bn, de, es, fr, it, ja, ko, pl, pt-BR, tr, zh-CN) — Updated third whyModernWins entry accordingly.

The two code blocks remain equivalent; only the explanatory copy is corrected.

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