fix typo

grading.py

 from pyspark import SparkContext
-from correct_functions import *
+from functions import *
 import re
 import sys
 
@@ -58,7 +58,7 @@ if taskno == 6 or taskno == -1:
 		print x
 
 if taskno == 7 or taskno == -1:
-	#### Task 9
+	#### Task 7
 	print "=========================== Task 7"
 	nobelRDD = sc.textFile("datafiles/prize.json")
 	task7_result = task7(nobelRDD)