fix typo (#20767)

add Transaction import

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sdk/docs/pages/dapp-kit/wallet-hooks/useSignAndExecuteTransaction.mdx

@@ -7,6 +7,7 @@ block with their wallet.
 
 ```ts
 import { ConnectButton, useCurrentAccount, useSignAndExecuteTransaction } from '@mysten/dapp-kit';
+import { Transaction } from '@mysten/sui/transactions';
 import { useState } from 'react';
 
 function MyComponent() {
@@ -63,6 +64,7 @@ import {
 	useCurrentAccount,
 	useSignAndExecuteTransaction,
 } from '@mysten/dapp-kit';
+import { Transaction } from '@mysten/sui/transactions';
 import { useState } from 'react';
 
 function MyComponent() {