mysql-schema: add information about several missing system tables

[time-and-fate]

What is changed, added or deleted? (Required)

As the title says.

Which TiDB version(s) do your changes apply to? (Required)

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By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)

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

• This PR is translated from: mysql-schema: add information about several missing system tables docs-cn#19944
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[Oreoxmt]

/cc @Oreoxmt

[ti-chi-bot]

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[Oreoxmt]

docs/mysql-schema/mysql-schema.md

Lines 118 to 122 in a468479

	<CustomContent platform="tidb">
	> **Note:**
	>
	> The `tidb`, `expr_pushdown_blacklist`, `opt_rule_blacklist`, `table_cache_meta`, `tidb_import_jobs`, and `tidb_timers` system tables are only applicable to TiDB Self-Managed and not available on [TiDB Cloud](https://docs.pingcap.com/tidbcloud/).

@Defined2014 Could you please confirm whether advisory_locks is applicable to/supported in TiDB Cloud? Thank you.

[Defined2014]

Not sure about it. Maybe ask the member of could team?

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-03-04 06:07:44.187481161 +0000 UTC m=+335377.316400900: ☑️ agreed by qiancai.
• 2025-03-04 06:11:04.151210522 +0000 UTC m=+335577.280130267: ☑️ agreed by Oreoxmt.

[Oreoxmt]

/approve

[ti-chi-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-7.1: #20444.
But this PR has conflicts, please resolve them!

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #20445.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #20446.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.3: #20447.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #20448.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #20449.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.4: #20450.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #20451.