delete 2 vCPU description.

[lilyjazz]

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• v7.3 (TiDB 7.3 versions)
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[lilyjazz]

@kaixu120811 PTAL

[LinuxGit]

LGTM

[ti-chi-bot]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-09-18 02:04:58.976352183 +0000 UTC m=+483064.943940218: ☑️ agreed by qiancai.
• 2023-09-19 10:16:55.197182317 +0000 UTC m=+598981.164770390: ☑️ agreed by ran-huang.

[ran-huang]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ran-huang

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