Weaviate connector: swap how-to video embed links (#378)

Author: Paul-Cornell

snippets/general-shared-text/weaviate.mdx

@@ -16,7 +16,7 @@
     <iframe
     width="560"
     height="315"
-    src="https://www.youtube.com/embed/Ldb7PZU-pR4"
+    src="https://www.youtube.com/embed/FvhJDUZM078"
     title="YouTube video player"
     frameborder="0"
     allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"