Update OKX explorer url (#1062)

Update OKX explorer url in explorers-in-ton.mdx

Author: Selina1442

docs/v3/concepts/dive-into-ton/ton-ecosystem/explorers-in-ton.mdx

@@ -117,7 +117,7 @@ When viewing the wallet address, you can find out which NFT it stores, and when
 
 This explorer is designed to provide comprehensive and detailed data insights into TON. Whether you're tracking wallet addresses, exploring Jetton tokens, or delving into NFT collections, it offers a user-friendly experience tailored for both beginners and developers.
 
-- Mainnet: [okx.com/web3/explorer/ton](https://www.okx.com/web3/explorer/ton)
+- Mainnet: [web3.okx.com/explorer/ton](https://web3.okx.com/explorer/ton)
 
 #### Features