Update encryption and compression functions

[dveeden]

What is changed, added or deleted? (Required)

1. Update the reference for the PASSWORD() function, which has been removed from MySQL 8.0 docs.

Might add more updates later

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• [x] v8.2 (TiDB 8.2 versions)
• [x] v8.1 (TiDB 8.1 versions)
• [ ] v8.0 (TiDB 8.0 versions)
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• [ ] v7.1 (TiDB 7.1 versions)
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• [ ] v5.1 (TiDB 5.1 versions)

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Do your changes match any of the following descriptions?

• [ ] Delete files
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• [ ] Need modification after applied to another branch
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[ti-chi-bot[bot]]

@mjonss: adding LGTM is restricted to approvers and reviewers in OWNERS files.

In response to this:

LGTM, with some minor suggestions

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[Oreoxmt]

@dveeden https://github.com/dveeden/docs/pull/6 PTAL

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-07-16 05:42:20.615355289 +0000 UTC m=+332562.606296759: :ballot_box_with_check: agreed by Oreoxmt.
• 2024-07-16 11:44:21.599690421 +0000 UTC m=+354283.590631890: :ballot_box_with_check: agreed by hfxsd.

[Oreoxmt]

/approve

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

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-8.1: #18265.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.2: #18266.