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Update documentation/docs/02-runes/03-$derived.md

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Co-authored-by: Yash Pandit <hireyashpandit@gmail.com>
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@ -19,7 +19,7 @@ Derived state is declared with the `$derived` rune:
The expression inside `$derived(...)` should be free of side-effects. Svelte will disallow state changes (e.g. `count++`) inside derived expressions. The expression inside `$derived(...)` should be free of side-effects. Svelte will disallow state changes (e.g. `count++`) inside derived expressions.
Subsequents results of a `$derived` expression are compared against its previous value. If they are referentially the same, the `$derived` won't propagate an update to its dependencies. Subsequent results of a `$derived` expression are compared against its previous value. If they are referentially the same, the `$derived` won't propagate an update to its dependencies.
```svelte ```svelte
<script> <script>

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