fix typo

Author: Simek

website/versioned_docs/version-0.81/intro-react.md

@@ -445,7 +445,7 @@ Now, when someone presses the button, `onPress` will fire, calling the `setIsHun
 />
 ```
 
-::info
+:::info
 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 the object, that 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`.
 :::