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Update 10-function.md

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docs/en/12-taos-sql/10-function.md
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@ -952,7 +952,7 @@ FIRST(expr)
**More explanation**:
- FIRST(\*) can be used to get the first non-null value of all columns;When querying a super table and multiResultFunctionStarReturnTags is set to 0 (default), FIRST(\*) only returns columns of super table; When set to 1, returns columns and tags of the super table.
- FIRST(\*) can be used to get the first non-null value of all columns; When querying a super table and multiResultFunctionStarReturnTags is set to 0 (default), FIRST(\*) only returns columns of super table; When set to 1, returns columns and tags of the super table.
- NULL will be returned if all the values of the specified column are all NULL
- A result will NOT be returned if all the columns in the result set are all NULL