fixed the tuple () wraps around example lambda

Author: Brennon York

examples/src/main/python/kmeans.py

@@ -68,7 +68,7 @@ def closestPoint(p, centers):
         closest = data.map(
             lambda p: (closestPoint(p, kPoints), (p, 1)))
         pointStats = closest.reduceByKey(
-            lambda (p1_c1, p2_c2): (p1_c1[0] + p2_c2[0], p1_c1[1] + p2_c2[1]))
+            lambda p1_c1, p2_c2: (p1_c1[0] + p2_c2[0], p1_c1[1] + p2_c2[1]))
         newPoints = pointStats.map(
             lambda st: (st[0], st[1][0] / st[1][1])).collect()