update links to react docs for part2d

Author: romanstetsyk

src/content/2/en/part2d.md

@@ -233,7 +233,7 @@ axios.put(url, note).then(response => {
   // ...
 ```
 
-This is not recommended because the variable <em>note</em> is a reference to an item in the <em>notes</em> array in the component's state, and as we recall we must [never mutate state directly](https://reactjs.org/docs/state-and-lifecycle.html#using-state-correctly) in React.
+This is not recommended because the variable <em>note</em> is a reference to an item in the <em>notes</em> array in the component's state, and as we recall we must [never mutate state directly](https://react.dev/learn/updating-objects-in-state#why-is-mutating-state-not-recommended-in-react) in React.
 
 It's also worth noting that the new object _changedNote_ is only a so-called [shallow copy](https://en.wikipedia.org/wiki/Object_copying#Shallow_copy), meaning that the values of the new object are the same as the values of the old object. If the values of the old object were objects themselves, then the copied values in the new object would reference the same objects that were in the old object.