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docs: Update key-attribute.md
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src/guide/migration/key-attribute.md

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@@ -59,8 +59,8 @@ Vue 2.x では、`<template>` タグに `key` を含めることができませ
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```html
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<!-- Vue 2.x -->
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<template v-for="item in list">
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<div :key="item.id">...</div>
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<span :key="item.id">...</span>
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<div :key="'heading-' + item.id">...</div>
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<span :key="'content-' + item.id">...</span>
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</template>
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```
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