doc fix

Author: microslaw

doc/source/user_guide/indexing.rst

@@ -712,14 +712,15 @@ as a string.
 
 .. ipython:: python
 
-print("to fix")
+    df2 = pd.DataFrame({'col1': [9, 8, 7, 6],
+                        'weight_column': [0.5, 0.4, 0.1, 0]})
+    df2.sample(n=2, weights='weight_column')
 
 ``sample`` also allows users to sample columns instead of rows using the ``axis`` argument.
 
 .. ipython:: python
 
-    df3 = pd.DataFrame({'col1': [1, 2, 3], 'col2': [2, 3, 4]})
-    df3.sample(n=1, axis=1)
+print("a")
 
 Finally, one can also set a seed for ``sample``'s random number generator using the ``random_state`` argument, which will accept either an integer (as a seed) or a NumPy RandomState object.