Tiny adjustments on useEffect.md

src/content/reference/react/useEffect.md

@@ -531,7 +531,7 @@ function ChatRoom({ roomId }) {
     serverUrl: serverUrl
   });
   // ...
-````
+```
 
 There are also many excellent custom Hooks for every purpose available in the React ecosystem.
 
@@ -788,7 +788,7 @@ export function useIntersectionObserver(ref) {
 
 Sometimes, you want to keep an external system synchronized to some prop or state of your component.
 
-For example, if you have a third-party map widget or a video player component written without React, you can use an Effect to call methods on it that make its state match the current state of your React component. This Effect creates an instance of a `MapWidget` class defined in `map-widget.js`. When you change the `zoomLevel` prop of the `Map` component, the Effect calls the `setZoom()` on the class instance to keep it synchronized:
+For example, if you have a third-party map widget or a video player component written without React, you can use an Effect to call methods on it that make its state match the current state of your React component. This Effect creates an instance of a `MapWidget` class defined in `map-widget.js`. When you change the `zoomLevel` prop of the `Map` component, the Effect calls the `setZoom()` method on the class instance to keep it synchronized:
 
 <Sandpack>