combineByKey examples and notes added

Author: pyspark-in-action

tutorial/combine-by-key/spark-combineByKey.md

@@ -198,10 +198,4 @@ So, you should get back an array something like this:
 
 Array( [A, (15., 3)], [B, (30., 2)], [Z, (28., 4)])
 
-
-
-sumCount = rdd.combineByKey(lambda value: (value, value*value, 1),
-                            lambda x, value: (x[0] + value, x[1] + value*value, x[2] + 1),
-                            lambda x, y: (x[0] + y[0], x[1] + y[1], x[2] + y[2])
-                           )
 ````