release 5.1: update table format for docs PDF display

[Oreoxmt]

First-time contributors' checklist

• I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

What is changed, added or deleted? (Required)

Modify the format of tables (of the following types) to grid_tables using https://github.com/Oreoxmt/pandoc-grid-table-converter, to make tables show well in docs PDF.

• Tables with mixed Markdown table syntax and HTML table tag (for example, <td><ul><li>x86_64</li><li>ARM 64</li></ul></td>, <br/>)
• Tables with HTML table tag <table>
• Tables with HTML table tag rowspan or colspan

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For details, see tips for choosing the affected versions (in Chinese).

• master (the latest development version)
• v8.0 (TiDB 8.0 versions)
• v7.6 (TiDB 7.6 versions)
• v7.5 (TiDB 7.5 versions)
• v7.4 (TiDB 7.4 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)
• v5.3 (TiDB 5.3 versions)
• v5.2 (TiDB 5.2 versions)
• v5.1 (TiDB 5.1 versions)
• v5.0 (TiDB 5.0 versions)

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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

[ti-chi-bot]

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[ti-chi-bot]

@Oreoxmt: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-verify	06acf48	link	true	/test pull-verify

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[ti-chi-bot]

PR needs rebase.

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