revert changes in SparkALS

Author: yinxusen

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

@@ -30,7 +30,6 @@ import org.apache.spark._
  */
 object SparkALS {
 
-// begin code
   // Parameters set through command line arguments
   var M = 0 // Number of movies
   var U = 0 // Number of users
@@ -87,8 +86,6 @@ object SparkALS {
       """.stripMargin)
   }
 
-  // end code
-
   def main(args: Array[String]) {
 
     var slices = 0