typo fixed

Author: chetkhatri

examples/src/main/scala/org/apache/spark/examples/ml/VectorIndexerExample.scala

@@ -42,7 +42,7 @@ object VectorIndexerExample {
 
     val categoricalFeatures: Set[Int] = indexerModel.categoryMaps.keys.toSet
     println(s"Chose ${categoricalFeatures.size} " +
-      s"categorical features: {$categoricalFeatures.mkString(", ")}")
+      s"categorical features: ${categoricalFeatures.mkString(", ")}")
 
     // Create new column "indexed" with categorical values transformed to indices
     val indexedData = indexerModel.transform(data)