Update 10-function.md

docs/en/12-taos-sql/10-function.md

@@ -5,9 +5,9 @@ description: This document describes the standard SQL functions available in TDe
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-## Single Row Functions
+## Scalar Functions
 
-Single row functions return a result for each row.
+Scalar functions return one result for each row.
 
 ### Mathematical Functions