Add a notice for pd configuration (#12674)

[ti-chi-bot]

This is an automated cherry-pick of #12674

Signed-off-by: Ryan Leung [email protected]

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Just as the title says.

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• v6.6 (TiDB 6.6 versions)
• v6.5 (TiDB 6.5 versions)
• v6.4 (TiDB 6.4 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
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• v5.2 (TiDB 5.2 versions)
• v5.1 (TiDB 5.1 versions)
• v5.0 (TiDB 5.0 versions)

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• Delete files
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[qiancai]

/approve

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