Fix typo: retuns to returns at functions-and-operators/tidb-functions.md

[mondayinsighter]

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Fix typo: retuns to returns at functions-and-operators/tidb-functions.md

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[ti-chi-bot]

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[ti-chi-bot]

Hi @mondayinsighter. Thanks for your PR.

I'm waiting for a pingcap member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[Oreoxmt]

/ok-to-test

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-04-29 05:35:31.12298751 +0000 UTC m=+249084.880123083: ☑️ agreed by Oreoxmt.
• 2024-04-29 05:44:32.565738463 +0000 UTC m=+249626.322874036: ☑️ agreed by hfxsd.

[Oreoxmt]

/approve

[ti-chi-bot]

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This pull-request has been approved by: Oreoxmt

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #17388.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.0: #17389.