[docs] [issue20740] Remove invalid number from squares in introduction section

[Pavel Kazakov]

Pavel Kazakov added the comment:

> (Alternatively, we could redefine squares in Python.  All other languages just have the regular squares;  Python has a super *extra* square 2!  That clearly makes squares in Python *better* than squares in other languages...)

Heh. I initially wasn't sure if I was just missing a super fancy feauture of Python, but I eventually concluded the 2 probably wasn't supposed to be there.

In the name of making Python better, since π and -1 have already been proposed as additional squares, I vote for including the constant e as well.

> Fixed, thanks for the report and the patch!

Great! Thanks.

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<http://bugs.python.org/issue20740>
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