fix pd cert allowed cn description

[hfxsd]

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• This PR is translated from:fix pd cert allowed cn description docs-cn#17259
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[hfxsd]

/approve

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #17402.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.6: #17403.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.0: #17404.