Update page.mdx

Update "extension" to "extensions"

Signed-off-by: Waren Gonzaga <[email protected]>

Author: warengonzaga

apps/portal/src/app/react/v5/migrate/contracts/page.mdx

@@ -33,7 +33,7 @@ Check out the list of over 100 prebuilt extensions [here](/typescript/v5/extensi
 
 Example: Import an ERC1155 "read" extension, for checking the balance of a wallet
 ```tsx
-import { balanceOf } from "thirdweb/extension/erc1155";
+import { balanceOf } from "thirdweb/extensions/erc1155";
 
 const transaction = balanceOf({
   contract,
@@ -169,4 +169,4 @@ function App() {
     Claim
   </TransactionButton>
 }
-```
+```