Add missing thumbnail urls

Author: amarantha-k

blog/2024/how-to-mint-nfts.md

@@ -66,8 +66,8 @@ Before diving into how to mint an NFT, ensure you have access to test accounts o
 "@type": "VideoObject",
 "name": "How to Mint an NFT on the XRP Ledger?",
 "description": "How to Mint an NFT on the XRP Ledger?",
-"uploadDate": "2024-02-29",
-"embedUrl": "https://www.youtube.com/watch?v=oGzKbQJCTJ0&t=9s"
+"uploadDate": "2024-02-29","embedUrl": "https://www.youtube.com/watch?v=oGzKbQJCTJ0&t=9s",
+"thumbnailUrl": "https://img.youtube.com/vi/oGzKbQJCTJ0/hqdefault.jpg"
 }
 </script>
 

docs/concepts/tokens/decentralized-exchange/index.md

@@ -32,7 +32,8 @@ The XRP Ledger's CLOB DEX is unique in that it does **not require** AMMs to swap
 "name": "What is a Decentralized Exchange, or DEX?",
 "description": "What is a Decentralized Exchange, or DEX?",
 "uploadDate": "2022-01-10",
-"embedUrl": "https://www.youtube.com/watch?v=VWNrHBDfXvA?feature=shared"
+"embedUrl": "https://www.youtube.com/watch?v=VWNrHBDfXvA?feature=shared",
+"thumbnailUrl": "https://i.ytimg.com/vi/VWNrHBDfXvA/maxresdefault.jpg"
 }
 </script>