Rule engine module: WHERE clause documentation is incorrect.

[GeXin666]

Version emqx/emqx:5.8.2, Docker deployment.

SELECT payload.data as d FROM "t/#" WHERE clientid = "foo"
The above is an example given in the official documentation. During actual testing, it was found that using double quotes does not work.

In another document, it was found that single quotes are required, and testing confirmed that using single quotes works.

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This issue was automatically translated from Chinese.

[github-actions]

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