docs: update one MVCC API example

[jackysp]

What problem does this PR solve?

Issue Number: close #52128

Problem Summary:

What changed and how does it work?

Update the doc.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Defined2014, lance6716

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-27 04:29:45.933613285 +0000 UTC m=+2042212.955859672: ☑️ agreed by lance6716.
• 2024-03-27 04:31:21.210250701 +0000 UTC m=+2042308.232497090: ☑️ agreed by Defined2014.