fix doc tests

Author: davies

python/pyspark/rdd.py

@@ -62,7 +62,7 @@ def portable_hash(x):
 
     >>> portable_hash(None)
     0
-    >>> portable_hash((None, 1))
+    >>> portable_hash((None, 1)) & 0xffffffff
     219750521
     """
     if x is None:
@@ -2015,7 +2015,7 @@ def countApproxDistinct(self, relativeSD=0.05):
         >>> n = sc.parallelize(range(1000)).map(str).countApproxDistinct()
         >>> 950 < n < 1050
         True
-        >>> n = self.sc.parallelize([i % 20 for i in range(1000)]).countApproxDistinct()
+        >>> n = sc.parallelize([i % 20 for i in range(1000)]).countApproxDistinct()
         >>> 18 < n < 22
         True
         """