[MINOR] Fix typo in RFC-93

[vinothchandar]

Change Logs

• Typo

Impact

None

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

None

Documentation Update

None

• The config description must be updated if new configs are added or the default value of the configs are changed
• Any new feature or user-facing change requires updating the Hudi website. Please create a Jira ticket, attach the
  ticket number here and follow the instruction to make
  changes to the website.

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:

• 109774e UNKNOWN

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