Enrich instructions for string functions FORMAT() and FROM_BASE64()

[ittuann]

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What is the related PR or file link(s)?

• This PR is translated from: Fix: Enrich instructions for string functions FORMAT() and FROM_BASE64() (#15487) docs#16085
• Other reference link(s): Enrich instructions for string functions FORMAT() and FROM_BASE64() docs#15487

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[ittuann]

/label 2024-tidb-docs-dash

[ittuann]

👋@xzhangxian1008 感谢您的反馈和建议！我已经在最新提交中加入了这些改进~

[xzhangxian1008]

LGTM

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[qiancai]

Rest LGTM

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[LGTM Timeline notifier]

Timeline:

• 2024-01-31 06:49:07.576574098 +0000 UTC m=+1548189.140871788: ☑️ agreed by qiancai.
• 2024-01-31 07:10:59.924255809 +0000 UTC m=+1549501.488553514: ☑️ agreed by hfxsd.

[hfxsd]

/approve

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #16464.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.6: #16465.