correcting version for default constructors

Author: Martin Brown

mllib/src/main/scala/org/apache/spark/ml/feature/HashingTF.scala

@@ -37,7 +37,7 @@ import org.apache.spark.sql.types.{ArrayType, StructType}
 class HashingTF @Since("1.2.0") (@Since("1.4.0") override val uid: String) extends Transformer
   with HasInputCol with HasOutputCol {
 
-  @Since("1.4.0")
+  @Since("1.2.0")
   def this() = this(Identifiable.randomUID("hashingTF"))
 
   /** @group setParam */

mllib/src/main/scala/org/apache/spark/ml/feature/StandardScaler.scala

@@ -61,7 +61,7 @@ class StandardScaler @Since("1.2.0") (@Since("1.4.0") override val uid: String)
   Estimator[StandardScalerModel]
   with StandardScalerParams {
 
-  @Since("1.4.0")
+  @Since("1.2.0")
   def this() = this(Identifiable.randomUID("stdScal"))
 
   setDefault(withMean -> false, withStd -> true)

mllib/src/main/scala/org/apache/spark/ml/feature/Tokenizer.scala

@@ -34,7 +34,7 @@ import org.apache.spark.sql.types.{ArrayType, DataType, StringType}
 class Tokenizer @Since("1.2.0") (@Since("1.4.0") override val uid: String) extends
   UnaryTransformer[String, Seq[String], Tokenizer] {
 
-  @Since("1.4.0")
+  @Since("1.2.0")
   def this() = this(Identifiable.randomUID("tok"))
 
   @Since("1.2.0")