Update intro-react.md

extented explanation why state denoted as a const

Author: Jonnius00

docs/intro-react.md

@@ -445,7 +445,8 @@ Now, when someone presses the button, `onPress` will fire, calling the `setIsHun
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 ```
 
-> You might’ve noticed that although `isHungry` is a [const](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/const), it is seemingly reassignable! What is happening is when a state-setting function like `setIsHungry` is called, its component will re-render. In this case the `Cat` function will run again—and this time, `useState` will give us the next value of `isHungry`.
+> You might’ve noticed that although `isHungry` is a [const](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/const), it is seemingly reassignable! The `const` keyword here does not mean that the state itself is immutable. rather, it means that the reference to an object [ ] (contains the state and the function to update it) will not change.
+> What is happening is when a state-setting function like `setIsHungry` is called, its component will re-render. In this case the `Cat` function will run again—and this time, `useState` will give us the next value of `isHungry`.
 
 Finally, put your cats inside a `Cafe` component: