Merge indentation fix in doc example from 3.3.

Doc/tutorial/controlflow.rst

@@ -19,14 +19,14 @@ example::
    >>> x = int(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