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docs: clarify how many times derived signals are called (#1614)

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docs/book/src/view/02_dynamic_attributes.md
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@ -145,7 +145,7 @@ Derived signals let you create reactive computed values that can be used in mult
places in your application with minimal overhead.
Note: Using a derived signal like this means that the calculation runs once per
signal change per place we access `double_count`; in other words, twice. This is a
signal change and once per place we access `double_count`; in other words, twice. This is a
very cheap calculation, so that’s fine. We’ll look at memos in a later chapter, which
are designed to solve this problem for expensive calculations.