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[3.15] Update an error message in the 'Functional Programming HOWTO' (GH-151047)

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(cherry picked from commit 81965c1683)

Co-authored-by: saber-bit <bryanventura0324@gmail.com>
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Doc/howto/functional.rst
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@ -1042,7 +1042,7 @@ first calculation. ::
>>> functools.reduce(operator.concat, [])
Traceback (most recent call last):
...
TypeError: reduce() of empty sequence with no initial value
TypeError: reduce() of empty iterable with no initial value
>>> functools.reduce(operator.mul, [1, 2, 3], 1)
6
>>> functools.reduce(operator.mul, [], 1)