fix typo in placement rules

[TomShawn]

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• v6.0 (TiDB 6.0 versions)
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What is the related PR or file link(s)?

• This PR is translated from: fix typo in placement rules docs#8011
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• Delete files
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• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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[TomShawn]

/merge

[ti-chi-bot]

@TomShawn: /merge in this pull request requires 1 approval(s).

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In response to this:

/merge

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[TomShawn]

/status LGT1

[TomShawn]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Details

Commit hash: d9375f2

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #8814.