[MINOR]Fix typo."funcitons" corrected to "functions"

[YongjinZhou]

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What is the purpose of the pull request

Fix typo."funcitons" corrected to "functions"

Brief change log

Fix typo."funcitons" corrected to "functions"

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This pull request is a trivial rework / code cleanup without any test coverage.

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Committer checklist

• Has a corresponding JIRA in PR title & commit

• Commit message is descriptive of the change

• CI is green

• Necessary doc changes done or have another open PR

• For large changes, please consider breaking it into sub-tasks under an umbrella JIRA.

[hudi-bot]

CI report:

• f7d0269 Azure: FAILURE

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