Update datetimepart.md

Author: seesharprun

articles/cosmos-db/nosql/query/datetimepart.md

@@ -22,7 +22,7 @@ Returns the value of the specified date and time part for the provided date and
 ## Syntax
 
 ```nosql
-DateTimePart(<date_time> , <date_time_part>)
+DateTimePart(<date_time_part> , <date_time>)
 ```
 
 ## Arguments