fix rust sdk docs error

[Antake2333]

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fix rust sdk docs error

Description

fix rust sdk docs error

Test plan

Fix the code and run build

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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:

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
sui-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 23, 2024 2:43am

[vercel[bot]]

@Antake2333 is attempting to deploy a commit to the Mysten Labs Team on Vercel.

A member of the Team first needs to authorize it.

[stefan-mysten]

@Antake2333 I had to rebase to pass the CI. Sorry for the delay!