Update the python version in the interpreter tutorial.

Doc/tutorial/interpreter.rst

@@ -155,7 +155,7 @@ Executable Python Scripts
 On BSD'ish Unix systems, Python scripts can be made directly executable, like
 shell scripts, by putting the line ::
 
-   #! /usr/bin/env python3.1
+   #! /usr/bin/env python3.2
 
 (assuming that the interpreter is on the user's :envvar:`PATH`) at the beginning
 of the script and giving the file an executable mode.  The ``#!`` must be the