Update React link to point to the new site (#3304)

Author: lkoida

src/guide/extras/rendering-mechanism.md

@@ -10,7 +10,7 @@ How does Vue take a template and turn it into actual DOM nodes? How does Vue upd
 
 You have probably heard about the term "virtual DOM", which Vue's rendering system is based upon.
 
-The virtual DOM (VDOM) is a programming concept where an ideal, or “virtual”, representation of a UI is kept in memory and synced with the “real” DOM. The concept was pioneered by [React](https://reactjs.org/), and has been adopted in many other frameworks with different implementations, including Vue.
+The virtual DOM (VDOM) is a programming concept where an ideal, or “virtual”, representation of a UI is kept in memory and synced with the “real” DOM. The concept was pioneered by [React](https://react.dev/), and has been adopted in many other frameworks with different implementations, including Vue.
 
 Virtual DOM is more of a pattern than a specific technology, so there is no one canonical implementation. We can illustrate the idea using a simple example: