SPARK-22830 Scala Coding style - Changes made

Author: chetkhatri

examples/src/main/scala/org/apache/spark/examples/HdfsTest.scala

@@ -39,7 +39,7 @@ object HdfsTest {
       val start = System.currentTimeMillis()
       for (x <- mapped) { x + 2 }
       val end = System.currentTimeMillis()
-      println(s"Iteration ${iter} took ${(end-start)} ms")
+      println(s"Iteration $iter took ${end-start} ms")
     }
     spark.stop()
   }

examples/src/main/scala/org/apache/spark/examples/SparkALS.scala

@@ -80,7 +80,7 @@ object SparkALS {
 
   def showWarning() {
     System.err.println(
-      s"""WARN: This is a naive implementation of ALS and is given as an example!
+      """WARN: This is a naive implementation of ALS and is given as an example!
         |Please use org.apache.spark.ml.recommendation.ALS
         |for more conventional use.
       """.stripMargin)
@@ -100,7 +100,7 @@ object SparkALS {
         ITERATIONS = iters.getOrElse("5").toInt
         slices = slices_.getOrElse("2").toInt
       case _ =>
-        System.err.println(s"Usage: SparkALS [M] [U] [F] [iters] [partitions]")
+        System.err.println("Usage: SparkALS [M] [U] [F] [iters] [partitions]")
         System.exit(1)
     }