update placement-rules doc about max-replica

[qiancai]

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• This PR is translated from: update placement-rules doc about max-replica docs-cn#16410
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[LGTM Timeline notifier]

Timeline:

• 2024-02-20 07:32:59.163926859 +0000 UTC m=+342467.911549955: ☑️ agreed by hfxsd.

[qiancai]

/approve

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #16535.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #16536.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #16537.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.4: #16538.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #16539.

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In response to a cherrypick label: new pull request created to branch release-7.6: #16540.