fixing hanging CustomDetails

arbitrum-docs/build-decentralized-apps/01-quickstart-solidity-remix.mdx

@@ -203,8 +203,6 @@ contract VendingMachine {
 
 </CustomDetails>
 
-</CustomDetails>
-
 ### Compile your smart contract with Remix
 
 Smart contracts need to be compiled to bytecode to be stored and executed on-chain by the EVM; we'll use Remix to do that.
@@ -426,7 +424,7 @@ Select `Arbitrum Sepolia` from Metamask's dropdown, paste your contract address
 The final step is deploying our Cupcake machine to a production network, such as Ethereum, Arbitrum One, or Arbitrum Nitro.
     The good news is: deploying a smart contract in production is exactly the same as for Sepolia Testnet.
     The harder news: it will cost real money, this time. If you deploy on Ethereum, the fees can be significant and the transaction confirmation time 12 seconds on average.
-    Arbitrum, a Layer2, reduces these costs about 10X and a confirmation time in the same order while maintaining a similar level of security and decentralization. 
+    Arbitrum, a Layer2, reduces these costs about 10X and a confirmation time in the same order while maintaining a similar level of security and decentralization.
 
 ### Summary