Explain that the useState setter triggers a re-render in Quick Start (#8667)

* Explain that the useState setter triggers a re-render in Quick Start

* Explain re-render behavior before naming it

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Co-authored-by: Dextheking1 <Dextheking1@users.noreply.github.com>
Co-authored-by: Aurora Scharff <aurora.sofie@gmail.com>

Author: 3 people

src/content/learn/index.md

@@ -336,7 +336,7 @@ function MyButton() {
 }
 ```
 
-React will call your component function again. This time, `count` will be `1`. Then it will be `2`. And so on.
+Calling `setCount` tells React to call your component function again. This is called a *re-render*. This time, `count` will be `1`. Then it will be `2`. And so on.
 
 If you render the same component multiple times, each will get its own state. Click each button separately: