indexint tab fix

Author: microslaw

doc/source/user_guide/indexing.rst

@@ -720,7 +720,7 @@ as a string.
 
 .. ipython:: python
 
-print("a")
+    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.