[MINOR] Fix typo in payload class config docs in Hudi Streamer

[yihua]

Change Logs

As above

Impact

Fix typo

Risk level (write none, low medium or high below)

none

Documentation Update

As above

Contributor's checklist

• [ ] Read through contributor's guide
• [ ] Change Logs and Impact were stated clearly
• [ ] Adequate tests were added if applicable
• [ ] CI passed

[hudi-bot]

CI report:

• fe5b7af94455bcb0f6b4ec2a964b1a153686fee5 Azure: SUCCESS

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