[docs] Sloppy example at sect 8.3 of Python 2.7.3 tutorial

Hi,

At http://docs.python.org/release/2.7.3/tutorial/errors.html sect 8.3, the first example block should ask the user for an "integer", not just a "number". I happily entered 1.23 without thikning too much and it failed.

There you go ! One Giant Leap .....