Fix indentation in doc example.
diff --git a/Doc/tutorial/controlflow.rst b/Doc/tutorial/controlflow.rst
index 4de9ec9..8ffaf3f 100644
--- a/Doc/tutorial/controlflow.rst
+++ b/Doc/tutorial/controlflow.rst
@@ -19,14 +19,14 @@
    >>> x = int(raw_input("Please enter an integer: "))
    Please enter an integer: 42
    >>> if x < 0:
-   ...      x = 0
-   ...      print 'Negative changed to zero'
+   ...     x = 0
+   ...     print 'Negative changed to zero'
    ... elif x == 0:
-   ...      print 'Zero'
+   ...     print 'Zero'
    ... elif x == 1:
-   ...      print 'Single'
+   ...     print 'Single'
    ... else:
-   ...      print 'More'
+   ...     print 'More'
    ...
    More