Fix for incorrect memory in Spark UI

Author: rekhajoshm

core/src/main/scala/org/apache/spark/ui/ToolTips.scala

@@ -36,8 +36,8 @@ private[spark] object ToolTips {
   val OUTPUT = "Bytes and records written to Hadoop."
 
   val STORAGE_MEMORY =
-    """Memory used / total available memory for storage of data like RDD partitions cached in
-       memory. """
+    "Memory used / total available memory for storage of data " +
+      "like RDD partitions cached in memory. "
 
   val SHUFFLE_WRITE =
     "Bytes and records written to disk in order to be read by a shuffle in a future stage."