fix typographical error in description field

Author: SihanoukSolver29

src/content/developers/tutorials/how-to-view-nft-in-metamask/index.md

@@ -1,6 +1,6 @@
 ---
 title: How to View Your NFT in Your Wallet (Part 3/3 of NFT Tutorial Series)
-description: This tutorial describes how to view an existing an NFT on MetaMask!
+description: This tutorial describes how to view an existing NFT on MetaMask!
 author: "Sumi Mudgil"
 tags: ["ERC-721", "Alchemy", "Solidity"]
 skill: beginner