system-variables: update docs for hint SET_VAR

[shawn0915]

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• This PR is translated from: system-variables: update docs for hint SET_VAR docs-cn#15207
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[ti-chi-bot]

Welcome @shawn0915!

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Thank you, and welcome to pingcap/docs. 😃

[Oreoxmt]

/cc @winoros

[hfxsd]

/verify

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[LGTM Timeline notifier]

Timeline:

• 2023-10-25 02:22:19.349496184 +0000 UTC m=+2401336.936606317: ☑️ agreed by hfxsd.
• 2023-10-31 02:01:01.109416989 +0000 UTC m=+2918458.696527134: ☑️ agreed by Oreoxmt.

[Oreoxmt]

/approve

[hfxsd]

/approve

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.4: #15223.

[shawn0915]

@Oreoxmt @hfxsd @winoros @Icemap thank you all. 🙏‍