Add docs for 32bits global kill

[pingyu]

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What is changed, added or deleted? (Required)

Add docs for 32bits global kill.
See pingcap/tidb#8854 and design doc.

Preview:

• tidb-configuration
• statement kill

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• master (the latest development version)
• v7.3 (TiDB 7.3 versions)
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• v7.1 (TiDB 7.1 versions)
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Do your changes match any of the following descriptions?

• Delete files
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[pingyu]

@songrijie Comments addressed, PTAL, thanks~

[ti-chi-bot]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-08-02 07:47:40.250595134 +0000 UTC m=+257944.192943664: ☑️ agreed by Oreoxmt.
• 2023-08-03 07:33:27.829420897 +0000 UTC m=+343491.771769427: ☑️ agreed by hfxsd.

[Oreoxmt]

/approve
/unhold

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Oreoxmt

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