Edits Video tutorials (#5748)

* edit community call playlist

* added whiteboard series video

docs/learn/learn-video-tutorials.md

@@ -30,7 +30,7 @@ seminars, and initiatives within the ecosystem.
   </div>
   <div className="col text--center">
     <a href="https://youtube.com/playlist?list=PLOyWqupZ-WGvJuOchUyo6eFB_RA76mv3h">
-      <img src="https://i9.ytimg.com/vi_webp/tbewfQM_19c/mqdefault.webp?v=65731978&sqp=CNztwK8G&rs=AOn4CLBOyQxD-cNsJZJeBWyjBrbikk3Ueg" width="350" style={{ borderRadius: 10, border: '1px solid slategrey' }} />
+      <img src="https://i.ytimg.com/vi/tbewfQM_19c/hqdefault.jpg?sqp=-oaymwEXCNACELwBSFryq4qpAwkIARUAAIhCGAE=&rs=AOn4CLDzJbgSFKb3wupT8g1L5dhIr2nIYA" width="350" style={{ borderRadius: 10, border: '1px solid slategrey' }} />
     </a>
     <p>
       <a href="https://youtube.com/playlist?list=PLOyWqupZ-WGvJuOchUyo6eFB_RA76mv3h">Polkadot Community Calls</a>
@@ -174,3 +174,20 @@ seminars, and initiatives within the ecosystem.
     </p>
   </div>
 </div>
+
+<div className="row">
+  <div className="col text--center">
+    <a href="https://youtu.be/xBfC6uTjvbM?feature=shared">
+      <img src="https://i.ytimg.com/an_webp/xBfC6uTjvbM/mqdefault_6s.webp?du=3000&sqp=COOQtLAG&rs=AOn4CLDc7t3gmeauOhro43lMkTj9hUnM5A" width="350" style={{ borderRadius: 10, border: '1px solid slategrey' }} />
+    </a>
+    <p>
+      <a href="https://youtu.be/xBfC6uTjvbM?feature=shared">Polkadot Whiteboard Series</a>
+    </p>
+  </div>
+  <div className="col text--center">
+
+  </div>
+  <div className="col text--center">
+
+  </div>
+</div>