[move-2024]Use some Move 2024 Syntax to update 'defi' example

[shaflow01]

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Description

Use some Move 2024 Syntax to update 'defi' example .And more convenient method calls.

Test plan

I built locally and allowed testing, and they all succeeded without warning

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Release notes

Check each box that your changes affect. If none of the boxes relate to your changes, release notes aren't required.

For each box you select, include information after the relevant heading that describes the impact of your changes that a user might notice and any actions they must take to implement updates.

• [ ] Protocol:
• [ ] Nodes (Validators and Full nodes):
• [ ] Indexer:
• [ ] JSON-RPC:
• [ ] GraphQL:
• [ ] CLI:
• [ ] Rust SDK:

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Name	Status	Preview	Comments	Updated (UTC)
sui-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 1, 2024 1:05pm

3 Ignored Deployments

Name	Status	Preview	Comments	Updated (UTC)
multisig-toolkit	⬜️ Ignored (Inspect)	Visit Preview		May 1, 2024 1:05pm
sui-kiosk	⬜️ Ignored (Inspect)	Visit Preview		May 1, 2024 1:05pm
sui-typescript-docs	⬜️ Ignored (Inspect)	Visit Preview		May 1, 2024 1:05pm

[shaflow01]

@stefan-mysten I don't know how to apply for review from the code owner. Could you guide me on how to do it?

[stefan-mysten]

Thanks for your contribution @shaflow01. For Move related code, you could tag this to devx-move, which includes all the Move team. Thanks!

[shaflow01]

@amnn Could you please check if my modifications are correct?

[shaflow01]

@amnn Sorry about didn't understand your meaning before. How long will they be merged ? Due to lack of experience, I used the main branch to submit this push request