sql: delete PLACEMENT(S) in keywords

[hfxsd]

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What is the related PR or file link(s)?

• This PR is translated from:sql: delete PLACEMENT(S) in keywords docs-cn#18285
• Other reference link(s):

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• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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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-8.2: #18494.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #18495.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.0: #18496.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #18497.