fix code style

Author: haoyuan

core/src/main/scala/org/apache/spark/storage/StorageLevel.scala

@@ -142,15 +142,15 @@ object StorageLevel {
   val MEMORY_AND_DISK_SER_2 = new StorageLevel(true, true, false, false, 2)
   val OFF_HEAP = new StorageLevel(false, false, true, false)
 
-  /** Create a new StorageLevel object without setting useOffHeap*/
+  /** Create a new StorageLevel object without setting useOffHeap */
   def apply(useDisk: Boolean, useMemory: Boolean, useOffHeap: Boolean,
     deserialized: Boolean, replication: Int) = getCachedStorageLevel(
       new StorageLevel(useDisk, useMemory, useOffHeap, deserialized, replication))
 
   /** Create a new StorageLevel object */
   def apply(useDisk: Boolean, useMemory: Boolean,
     deserialized: Boolean, replication: Int = 1) = getCachedStorageLevel(
-        new StorageLevel(useDisk, useMemory, false, deserialized, replication))
+      new StorageLevel(useDisk, useMemory, false, deserialized, replication))
 
   /** Create a new StorageLevel object from its integer representation */
   def apply(flags: Int, replication: Int): StorageLevel =