Update usage scenarios for placement-rules-in-sql.md

[TomShawn]

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• This PR is translated from: Update usage scenarios for placement-rules-in-sql.md docs-cn#9279
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[TomShawn]

/status LGT1

[TomShawn]

/merge

[ti-chi-bot]

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

Commit hash: c91ca09

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.0: #12023.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #12024.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.2: #12025.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.3: #12026.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.4: #12027.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #12028.