[docs] itertools.product - missing documentation of usage of *

[Madsen, Bjorn]

Itertools.product has a "magic" function that isn't documented:

The usage of * as precedent to a list of lists of variable length.

Example:
>>> from itertools import product
>>> list(product(*[[-1,1], [-2,-2.5,2], [-3,3]]))
[(-1, -2, -3), (-1, -2, 3), (-1, -2.5, -3), (-1, -2.5, 3), (-1, 2, -3), (-1, 2, 3), (1, -2, -3), (1, -2, 3), (1, -2.5, -3), (1, -2.5, 3), (1, 2, -3), (1, 2, 3)]

The function works perfectly. The documentation of the usage is missing.
Please add it.

Kind regards

Bjorn Madsen, Ph.D.
Head of System Design Tools
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