Add resource for DOM (#5232)

* Update 102-shadow-dom.md

These changes are important from a student's perspective.

* Update src/data/roadmaps/frontend/content/113-web-components/102-shadow-dom.md

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Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

src/data/roadmaps/frontend/content/113-web-components/102-shadow-dom.md

@@ -4,4 +4,5 @@ An important aspect of web components is encapsulation — being able to keep th
 
 Visit the following resources to learn more:
 
+- [@video@DOM vs Virtual DOM vs Shadow DOM](https://youtu.be/7Tok22qxPzQ?si=2cw36PNSgFTcNHWx)
 - [@article@Using shadow DOM | MDN web docs](https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_shadow_DOM)