Update UT

Author: tanelk

sql/core/src/test/scala/org/apache/spark/sql/execution/command/DDLSuite.scala

@@ -1871,6 +1871,8 @@ abstract class DDLSuite extends QueryTest with SQLTestUtils {
             |    Examples:
             |      > SELECT 3 ^ 5;
             |       6
+            |
+            |    Since: 1.4.0
             |  """.stripMargin) ::
         Row("Function: ^") ::
         Row("Usage: expr1 ^ expr2 - Returns the result of " +