lightning: document logical-import-batch-{size,rows}

[kennytm]

What is changed, added or deleted? (Required)

Document the Lightning configuration tikv-importer.logical-import-batch-size and -rows.

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

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• master (the latest development version)
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What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s): lightning: allow configure the desired size and number of rows of each INSERT statement for logical mode tidb#46997

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

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[Oreoxmt]

Rest LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-22 09:34:22.477193206 +0000 UTC m=+1628489.499439593: ☑️ agreed by Oreoxmt.

[hfxsd]

/approve

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