fixing doctest: the order of 1,4,2 depends on hash and is not unique

Author: realead

pandas/core/base.py

@@ -1200,9 +1200,9 @@ def value_counts(
         >>> s = pd.Series([3, 1, 2, 3, 4, np.nan])
         >>> s.value_counts(normalize=True)
         3.0    0.4
+        1.0    0.2
         4.0    0.2
         2.0    0.2
-        1.0    0.2
         dtype: float64
 
         **bins**